Yeah I wondered that. One possible answer could be that Little Paulie wasn't yet a made guy at the construction site, as that was season 5. When the thing with Chris happened he may have been a made guy as it was later on. The severity could be another thing, I mean, Eugene did fuck him up pretty good, but Chris could have killed him, and almost paralyzed him.
Another possiblity is that, like at other times in the show, the writers either A, didn't realize the inconsistency or B, just didnt give a shit.