Hm, they do look the same... Maybe they were done by the same artist?
I don't think they would look at older games for inspiration for something like lens glare.
Given how many Wario Land 4 resources were reused in Mega Microgames... I think they probably would. And there's nothing wrong with that. WarioWare was a risky endeavour back in the GBA era, so any effort/cost saving is for the best.