I agree on all points with TarnShip. I do agree not all paints are alike regardless of brand; whether it's Vallejo, Model Master or Tamiya. I use Model Master almost exclusively because of the ease of availability, use and has wider color palette. I do use Tamiya, Gunze Aqueous/Mr. Color brands as well because I like the shades of color better than of Model Master's. IF... I can find it.
Do keep in mind, colors on WW2 aircrafts do fade throughout the war due to being exposed the elements. WW2 Russian aircrafts is a good prime example. Some colors were originally a light shade when first applied on and then it becomes darker in time and vice versa. There's really no right or wrong colors.
I will tell you this, for a month I created my own color conversion chart of all Testor's Model Master colors and try and match as close as possible to Humbrol, Tamiya, & Gunze Aqueous/Mr. Color. I try to avoid having multiple colors of Model Master paints matched with one brand. For example, Tamiya's XF 52 is matched with 2 different Model Master colors according to the paint4models downloadable chart. Two totally different shades. I had to make a decision to choose which one I think is the batter match.
Oh I have times I was in doubt I actually went out and do a color comparison check - visually and physically (open the bottles and taking a sample from your fingertip onto a piece of paper. Compare when it's completely dry) I've done this many times and I've seen some colors come out darker, lighter, and sometimes way off the charts than the other.
Is my own chart perfect? Nope. Far from it. It may not be completely right but I feel in my own mind, it's good enough and close enough for me. Unless I find out more by researching on the model subject I'm working on. Remember, it's all about preference. Don't go crazy trying to figure out which is the correct color shade. It's a hobby, have fun with it.