There is no such cartridge. Never has been and probably will never be despite how badly some laymen want to rename cartridges for nefarious reasons.
Nor has there ever been a ".45 Short Colt", ".45 Medium Colt", .45 Extra Long Colt", etc. The correct designation for subject cartridge is ".45 Colt". Period.
To paraphrase James Carville, "It's the headstamp, Stupid".
That’s why I put it in ().