Big difference between the Rangers and the Kings. The Rangers are in a tough spot, and they are "bummed out" ... they have given up. The Kings were down 3-0 in round 1 - sure, it was just round 1, not the SCF - but they never looked like they were out. No quit.
Good teams like Boston, LA, Chicago, etc etc, never quit, and they don't get desparate like the Canadiens did in game 7 against NYR. Good teams just keep doing what works until they claw their way back.
Maybe NY can capture some magic, but it sure looks like they have quit.