ipad mini retina is thicker and heavier
I obviously haven't held a Mini 2, but if you can tell 0.3 mm of thickness while holding and looking at the screen, then kudos for you!
Doubt it but some covers/cases might be really fuzzy while others might not be. This is a leather case though, feels like the only possible difference would be that it would be fitted slightly firmer, however, if anyone knows about flaws in my thinking that would be appreciated.