Do north Croats pass better in Austria or south Croatia?

[kevinmac]

South Croatia

[Jana]

Also out of curiosity, where is the border between north and south Croatia?

Black is south Croatia yellow North.

[Karol Klačansky]

is there even a genetic difference between north and south croatians? I know croatians in vienna from everywhere, and the only thing I notice about the southern ones is they are distinctly taller. They both look essentially balkan to me