The injectors for the newer 2V Monsters are all the same. Part # 280.4.007.1A FWIW these are about $520 retail. The 4V Monsters use an injector like the older Superbikes and wont fit the Monster throttlebodies.
FYI, if nozzle pattern and flow matching is important to you, Russ Collins (RC Engineering) can do that too (assuming they have injectors that will fit a Monster). I just picked up a set of RC injectors for my BMW R1100S that are flow matched to within a 1/4% at 80% duty cycle.