Thanks for the replies guys, forgot about Savage Lee. It's actually just the ones with different named locations I'm after , so the location for both Savage Lee's would be TH - Divide, both King Mong's spawn points would be Eridium Blight etc. But someone like Scorch can appear in both Frostburn Canyon and Digistruct Peak). I'm guessing there actually isn't any aside from the Digistruct Peak ones.
In which case, does anybody have a list of bosses that appear in Digistruct Peak as well as elsewhere. I've only just unlocked OP7 (Haven't finished the peak at OP7 yet, ran out of ammo and got taken out by the damn surveyors....poor strategy on my part), so past OP6 I'm not really sure who else gets added.