Could be stylistic rock paper scissors. Their "skill" isn't different typically but rather their approach to the game. It's also relative. Black did some careless things in both games, like giving up the central pawn and Nxe2 despite the knight being great and the bishop bad.
In the second game's opening 3.Be3! was better as the c-pawn restricts black, he'll need to accept some positional weaknesses in order to free himself further. 2...e5?! was a dubious choice since it's a target and can't support a ...d5 advance from e5.
3.c4 doesn't do anything concrete in the position, you really want to restrain that d5 square and 3.Nc3! does so much better. 5.e4 was positionally suspect because it left a gaping hole on d4 while e3 is no longer available in case of ...Qb6 with pressure against f2.
6...Ng4! gives much more for black, f2 is so weak. 6.Be3! would save white. 6...Bxe3 7.fxe3,d6 8.Be2 and the doubled pawns restrain some valuable squares while also opening some files.
Also, wrong recapture, 10.Qxe2 keeps the e-pawn defended. 10...Bxf2+?? just loses.
11.Nxf2 would have been a safer recapture, though 11.Kxf2?! still wins for white.
12.Kg1 stays winning, 12.Ke1? leaves white only slightly better and actually gives black compensation for the lost piece.
13.Nf2! keeps an edge for white by confronting the active knight. White may be playing a defensive game here but he's still up a piece. The king is looser after the game move.
13...Nxc3?! is still equal, but 13...Re8! bringing another piece into the attack while maintaining the tension seems good for black.
Being a 1400 player just feels like im stuck in a void, on one hand it seems like some players have a response to everything I can think of, while on the other it's like they have no idea what their doing.
for example:
Why is there so much diversity of skill in the 1400 rating class?