overall the variant of each GPU only differs bout more or less 5% in terms of performance
so 1 might be 5% better, 1 might perform 5% worse
overall it's almost identical
except for the model and cooling solution of course
also
they have different brand :v
PS: those GPU aren't meant for gaming (although they can), i suggest u get something from the newer gen like 1050 / RX 560 / 1050ti which will last longer for your system
if u want to buy used to save up some cash, 750ti can work as an alternative