It’s fine if you have headmates that appear as different races in your headspace. You can’t exactly control what they look like. The only things are they have to understand they are not that race when fronting if it is different from the body’s race.
It’s also a debated topic about headmates having names of their race if the body isn’t that race (such as a white body having alters with Asian names) so it might be wise to try and at least have alternate names or not use a name of that race if you aren’t a part of it to stay out of drama. (That’s just a suggestion though. I’ve yet to see too many systems get yelled at for it so it doesn’t seem too common)
/gen