It has the commander binoculars from the centurion. would be more usable than the current Commander binoculars…
It has a Commander turret override. from the centurion.
It has a ACU in the back of the turret (I know ACUs aren’t a thing yet)
Electrical turret traverse drive, capable of traversing the turret at
It had a floor cover for the ammunition to protect the crew from the ammunition, and to provide a stable floor, this also covers the munition from shrapnel
I think the binoculars and wider tracks seems to be the only ones that could currently be implemented. I think internal armor and covers are generally not modeled or are invisible on the x-ray inspector for the vehicles they exist in, so it’s very hard to tell if they are in the game or not.
While you’re at it, there’s actually two versions of the Strv 74: H-vagn: A pair of combined hydraulic gearboxes resulting in 4 forwards and 1 reverse gears. I’m unsure if it may have had two reverse gears since it used two gearboxes with a 2+1 config married together. The instruction book seems to indicate only one reverse gear for the vehicle so I’m going with that for now. V-vagn: A mechanical gearbox with 5 forwards and 1 reverse gears.
The one in the game is some sort of mix I think, but with 6 forward gears if I recall correct.
Edit: They probably based the Strv 74 on the Strv m/42 TM which wasn’t used, based on the transmission-scheme from my comment below. The variants used was the TH and TV, hence the H- and V-subfixes.