I like that last in first out theory, I can imagine those '44 rifles being stacked against a back wall at hollands or elsewhere, awaiting scopes and filling up a store room, then MK3 32s coming into the factory in increasing numbers as well as '45 rifles at the same time, they could have just carried on production and used the 44's as a fallback if the 45's arrival slowed down.
"stick 'em over there with them Savages, they'll all get used up in the end, who knows how long this bloody war 'll last"