All those pictures are of the later F88 / F89 as the wipers are in the normal place and not the top of the screen. There were several subtle changes made which are not noticable at first glance.
Transverse front indicators, single chrome grab handle next to radiator cap. chrome grab handles near doors, single opening air flap, slowly changed to:
Vertical indicators, twin plastic grab handles, black plastic door grab handles, twin flaps, brown interior.
The German Horsepower per Tonne rating was never enforced, only a proposal but all the foreign manufacturers were ready for it. Ford, Mercedes 1732. MAN 320. DAF 330 Volvo F89, Scania V8. They were already running at 40 tonne and we had just nicely raised our weights to 32 ton.