There is no such thing as race in Europe. You still do not understand the very fundamentals. The forms would not indicate white, they'd indicate Croat and Serbian. Here's the census from back when they shared a country: [0]. Note the absence of "white".

A Croat will never agree they are the same anything as a Serb.

Your limited understanding smushed millennia of history into the primitive categories your country developed in it's short existence. They have zero meaning here and your continued ignorance serves as example why it would be better for everyone if you stopped talking about things you know nothing about.

[0] https://en.wikipedia.org/wiki/Demographics_of_the_Socialist_...