I have some seeds for all 3 colors for trade.

Not isolated seeds for non isolated seeds.Seeds I baught for a trade of isolated seeds only.

The white thai I have goes from green/white to orange to red.
I was told it was supposed to be white only when ripe.

I also have a creme thai that is supposed to be white too but I haven't grown it out successfully yet.

Red Peter seeds grew true and shaped like they were advertised to look.
Orange and yellow ripen to different shades of orange.
Yellow turns a yellow orange after a long period of being yellow.
Orange ones went from green to dark orange when ripe.

I think of all colors the yellow put out the most true looking pods...
Red was about the same ratio of true looking pods as the orange.
Orange put out the biggest pods,then yellow and smallest was the red.
Might be different in the ground or in bigger pots.
Mine were in #5 (3 1/2gal.) pots.

I only grow non bell peppers and nothing else(no flowers or vegies).