@monkey123
Utilizing knowledge from outside of the isekai world's knowledge (aka cheating) is a staple of isekai, especially power fantasy/growth isekai. Whether it be through an encyclopedic knowledge of the game, a casual mental download of wikipedia that enables them to port over whatever Japanese conveniences they wish, or simply through a broken power set. That's nothing new, nor does it necessarily define a character.
As for smirking, that is an action that people undertake. However, although this action is undertaken by both characters (in part due to artistic license and the exaggerated impact demanded of the medium), oftentimes they do so for different reasons. Regardless, this is also very common. Although both MCs do have an underlying foundation of generic wish-fulfillment self-insert male lead, these genre cliches don't make characters identical as you suggested (you specifically said 100% copy).
Both of the things you mentioned can be used to label countless other isekai MCs. Log Horizon's Shirou for instance, is literally famous for his "evil smirk", and has a reputation for being an incredible player due to his immense game knowledge that astounds other max level regulars from time to time.
