I have a client who wants to have the same app but different backgrounds colours distributed on the app store. Like App Blue (with its own bundle id), App Yellow, App Red, App Green.....
The difference between them is mainly the background colour and just some small details.
Is it allowed?
I agree with Brigitte, unless they are specifically branded differently. Like if by the different colors they are for different brands entirely, that would be fine.
If you do end up going that route, you're probably going to want to use different "targets".