Jahna,
You are going to be very lucky to get the "color code" for these. Unless you know who painted, or owns the aircraft(s) the chance is slim.

But, as an example, I wanted to do a helicopter that is French, and found the color code, but being from a different country, they do not cross over. (I got the code from the mfg, and it was useless to me) What I ended up doing was going to the paint store armed with all my pictures (as different lighting makes the color look different) and found the closest matches for the colors. No one but me knows the colors are not perfect, and I have had compliments on how well the colors matched.

Best