Katarn's more skilled for sure, but not to the point where its a massive gap. Ben was already stomping nexus amped Sith/beating Kel Dor weaponsmaster's with his bare hands. His opponents were much more skilled/varied than Kyle's was at the same age, given a few more years he likely would've surpassed him.
Hard to say where he maxes out at though, but given his potential as a Skywalker he's up there for sure