Yeah, I think he would have reacted just as severely, especially as regards his brother, but obviously he and Pumyra do have a different connection than he has with the other cats.
I think he and Tygra would be much more inclined to arm punches and feigning apathy than to face caresses.
He seemed a lot more concerned with her after he rescued her than any other cat who had been hurt. I mean, for Christ’s sake! Panthro got his arms cut off and Lion-O was just like “you’ll be fine.”
While I do see Pumyra as being them more aggressive one in any potential relationship between her and Lion-O, once he understands her feelings I’m sure he’ll give as good as he gets.