Natural Cream and Maritime White are so similar I wonder if you'd be able to tell that they're two different colors. They both belong to the Yellow hue family.

When it comes to the theory that colors have undertones - especially paint colors - you should know that everyone is making that up as they go. Colors don't *have* undertones. It's not a fact. Undertones are just someone's subjective opinion of how a color looks under unspecified light sources in some random context. Which means no one can get a color's undertone wrong because it's however it actually looks in their opinion.

When we compare the factual color attributes (think of it as color DNA) Natural Cream and Maritime White are very similar. You don't have to understand the numbers in the table in order to see just how similar they are.

Basically the only difference is Value/LRV which is why I wonder if you'd be able to tell they're two different colors in two different room's inherent lighting.

There is no way to anser this question . Only you know how colors look in your spaces and I agree the undertones are just how it looks in your space. Make sure all your lighting is LED paint some sample boards and move them around to see how they look next to each other and with the stuff you own.

I think it’s just a preference. There is no rule and I prefer complementing the decor and creating more unique rooms (have 4 different coloured bedrooms as well as the dining room). In the open areas, have used the same color. See info below and painting rooms a different color is probably done more often than not.