Hey,

BETUP (Uttar Pradesh Board of Technical Education) is a board which provides affiliation of collages.

UPTU (Now AKTU) is public collegiate university which offers certain courses.

Here, UPTU is a collegiate university in which functions are divided between a central administration and a number of constituent colleges.

Difference You may find here is BETUP and UPTU both offers course and affiliation but BETUP is a Board Standard whereas UPTU is public collegiate university.