Yes, these paint colors flow well and have cohesive flow. They both have purple undertones and look good together.

Context is key.

To go a bit lighter in the hallway, should i go with Balboa Mist or lighten collingwood by 25%?

I'd pick one. I do not see a big enough difference between the 2.

CollinCollingwood is my favorite paint color. You cant go wrong with this one.

Have you thought about using your favorite in both rooms, especially since you want a nice flow. Could be the examples below, but they seem to have different undertones. (I used the same creamy white in our foyer, living room, kitchen and hallway and it made the spaces feel connected/larger.)

Your best bet is to purchase test pots, as daylight and your lighting will affect how colors feel. Cutting by 25% is a decision only you can make after testing it and in general, be sure to consider flooring, furniture, and decor. Maybe test a few lighter shades and article below is quite informative.

https://thecolorconcierge.com/classic-gray/

I would pick the one you like best and not have 2 different colors. There isn't enough variance to make a distinguishable difference and may look more like a mistake than a deliberate choice.

As a follow up question, I ended up going with collingwood in the dining and living room but the colors look different despite the same 2700k lighting. any ideas how to make them appear similar in both rooms? it appears greenish to me in the living room. the paint sample is balboa but collingwood is on the walls. Both colors appear green around the corner.

The inherent lighting is different in each of those rooms.

Light quality impacts upon how we perceive colours and near neutrals such as Collingwood are far more prone to these changing effects than more colourful colours.

I would embrace the differences as adding variations in atmosphere, despite being the same colour.

Plenty of people will tell you to change your lightbulbs. And that to a degree, can have some effect, but only of use if you intend to sit with the lights on all day, every day.

if you are after a colour which looks similar in each room, then you would need to choose something far more colourful than Collingwood. More colourful colours are literally stronger & more robust to the impact of changing light quality.

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It's very likely that within about a week or two the color constancy function of your vision system/brain will even out the color appearance. In a few months you'll forget you ever noticed a difference.

Would it help to keep the dining room light at 2700k and increase the living room to 3000k to even out the color?

When comparing to BMist, note it is leaning towards a green undertone (see graph) and depending on room’s lightning (day and night) it will be more or less pronounced.

If you like the color, having rooms feel slightly different is not a bad thing. Probably any color you chose, you’d run into the same thing.

Thanks! I thought collingwood would have violet undertones, thats why I chose it lol. I tried to avoid green but now that its up, any ideas to make it more violet looking?

Grays tend to shift. I would decorate (art, rugs, etc) and see what you think then. Paint differences may become less apparent once you have accessorized, etc.

Can I ask what flooring you have and if it is the same in both rooms?

Selecting neutrals is often more about choosing what works together and how they compare to other large elements in the room. Flooring and walls are the two largest areas in a room.

I used a color that would be far more pink than most people want for their walls. But I have a large pink brick wall between my living room and foyer. My flooring in the foyer is a purple, red and green slate, so although the dark gray looks gray it is actually a violet gray with a considerable amount of purple. The flooring that I have selected for my living room is another taupe with an obvious purple/pink undertone.

Most of the taupe (purple undertones) paint colors were going muddy or green in the space including Collingwood, Balboa Mist.

I selected BM Frosted Toffee

Here are some of the colors I tried next to either frosted toffee or collingwood.

You may have to go more purple than to get the neutral you were looking for.

As for lighting, everyone likes what they like - there is no right or wrong answer, but you do need to understand how the color of your lighting will impact the colors on your walls.

My favorite color is purple. Shining a yellow light on purple , adding yellow to purple makes brown/gray, they are complementary colors / opposites.

I don't want my beautiful purples and wine reds turning muddy or orange when I turn on my lights.

I use daylight lightbulbs / 5000k

My sister loves green and burnt orange and golds - fall colors.

She uses 2700 k lighting and her rooms just look richer and warmer when she turns on the lights in the evening.

With 2700 k lighting my colors turn to mud.

My violet undertones in sw anew gray only become real noticeable in the morning when the east sun comes through the house and when it snows outside. Do you live in a snowy climate? If so you may see the violet undertones more in the morning and when it snows outside with BM collingwood.