I'd go with mixing Dover White at 125%, it that is possible. Fractions of pastel formulas are sometimes not exact. You can also compare the colorant formulas for the Dover White, what it would be at 125% (give or take a little) and the Aged White to make sure they are the same tones (Annie may know -- I don't). Have you seen subtle striping done with the same color in different sheens (paint everything flat and create stripes with a higher gloss finish in the same color)? Or putting a gloss coat over to create stripes -- I saw a wall done with a shellac or clear coat, but I wondered what it would be like to have to paint over that down the road.

Thanks! Is there anything from SW or BM that is similar?

Can I ask how you are sampling these colors? You want to be looking at them in your space with the colors that are going to be next to them and looking at them without interference from other colors that will no longer be in the space and with the lighting that you will have in the space, both natural daylight and evening artificial light. You need to look at them in various areas of the room - some walls may get more sunlight than others, some may have gray shadows. You need to be looking at large samples. I look at colors every day and still like to view whites as 18x24 samples. Without experience I often recommend painting a 1/2 or full sheet of drywall to test your top contenders. Not too long ago we had a woman post her dilemma on Houzz. Everyone was trying to help her. Between us we explained LCH and lighting and our own experiences with whites. She had color matches done by different brands, bought dozens of samples, mixed her own samples and then after about 150 comments she posted a picture of her samples. She was looking at small samples next to each other instead of large samples tested independently. This was her response after trying my suggestion of painting 2 pieces of drywall and never viewing more than 2 colors at a time. @Jennifer Hogan your suggestion was brilliant. I wish I would have done the big pieces of drywall testers in the very beginning! in doing this, I found that I actually liked a few different shades that I believe I’d be happy with. Not comparing the colors I was considering to multiple other whites next to it or other testers on the wall to distract was a game changer....in addition, seeing it in a larger scale and bringing it into multiple different rooms w my samples also helped me appreciate the color even more, or throw it out until I ended up with 2 I liked. it’s a bit of a rainy day here today- so just to be sure, I’m going to go check them out again tomorrow w better sunlight & make the choice :). Thank you so much for this recommendation.

Went to SW and I was correct that they have discontinued Twinkle. They do have the formula, but not the sample chips. I did find a few alternatives. On the left is SW Hinting Blue that I used on the screened Porch ceiling. Too dark! On the right is SW Iceberg. Leans green and a little too dark for ceiling, IMO. The other colors from left to right are: SW Blue Horizon - I think it too baby blue. SW Glimmer - A tad more gray SW Snowdrop - Leans purple SW SW Sky High - Might just be the one! These were photographed this morning on a rainy day. Seen in opposite direction and later in the day, with clouds. Thoughts?