Fenix TK11 & TK15 switches compatible/interchangeable?

[JerryBob]

Are they the same switch? I have TK11 spare switches, and a bad TK15 switch I need to replace. (I'd take my TK15 apart and compare them, but I can't get the tailcap ring out; looking for help with that, too. It's stuck, with sugar on top.)