Note that it does not matter whether the name is in caps or lowercase; these are merely the defaults.
Keen finale file name
#Keen 1 : %patch $853D [$2C62W] #Text called from %patch $15CB2 "FINALE.CK1" $00 #Keen 2 : %patch $53DB [$2B6CW] #Text called from %patch $1A2EC "finale.ck2" $00 #Keen 3 : %patch $5CF0 [$2CDCW] #Text called from %patch $1C4FC "finale.ck3" $00
Finale and endtext level
Interestingly in Keen 2 the level changes after the Vorticon Mothership sequence to level 81, the same level it was already changed to. However this means that a second level can be used when the Game Over\High Score window appears after the endtext.
#Finale level %patch $53E4