@phil777 they are indeed similar, and i find both of them to be pretty enjoyable.
the problem is that both of them know the original events that "should" happen.
if they were to meet while still inside the game timeline both of them would realise fairly quickly than the other is acting strange.
they are both doing actions almost the opposite of what the original character did after all.
the best time to make a crossover might be after they finish school and by that point anything can happen....
you could also slap in "Botsuraku Youtei Nanode" if you want to for shits and giggles, it's like piggy duke except the MC actually knows how to go on a diet