That sounds like it could be an M-1 headache for the Quartermaster Corps. to figure out which M-1 the unit is asking for
That's what the sing-song nomenclature is for, though.
They developed a database array of individual vectors subdivided.
So, a Corps Artillery unit might have
Cannon, M1, 155mm with Limber M1A5, pulled by Tractor, High Speed, M8
And, Carbines, M-1; Rifles, M-1, and so on.
But, the supply started at the Company level and kept getting kicked up the chain to where ever the actual replenishment occurred.
Worst case would likely be an Armored Division in the 40s, where they'd have Scout Car, M3; Half-track, M3; Light Tank, M3; and medium Tank, M3 all on the books at the same time. While also having a Gun, 37mm, M1 on Mount, M3A1 on the books, too.
But, they did end the confusion of Cannon, 75mm, Model of 1895; Howitzer, Field, 75mm, Model of 1901, and Gun, Field, 75mm, Model of 1903--all of which were functionally the same weapon, just used differently (by 1919 we had three "french 75s" in service, all while fielding a US-made, US-version at the same time.
Ordnance later developed the Howitzer, Field, 75mm, M1, on Mount [fill in the blank].