This seems to be the weird hill you’ve elected to die on, but every single coach, player, and analyst that’s ever lived have agreed that there is a notable difference between regular season hockey and playoff hockey.
The refs call the games differently. That’s just the truth, a truth made self-evident to anyone who’s watched even a shrivel of playoff hockey post-06 lockout.
No, it’s not a totally different sport. But regardless of how many times you say “no it isn’t!!!!!” (since I’ve lost count and I’m certain you have too): playoff hockey is not officiated the same and thus not played the same as regular season hockey.