Are there different HL10 models?

Yes the is!....

Older CS series(CS50, CS55, CS70,...) --All Discontinued!-- can only use the L shaped tip.

#60961-32

CAT#: 1402

The new CS series (CS540, CS530, CS520...) take the straight tip HL10, however the new series can use the L shape as well.

#60961-35

CAT#: 2320