Ball and trunnion 4 spd

So, when you swap the main drive in…can the gears from the early trans stay with it? Sorry for the dumb questions, but I’ve never been inside an 833. Like most all old men start a sentence about cars, “Back in my day, if a 4 speed didn’t work right…we’d pull it out and go pay $25 for one at the junkyard that did!” LOL