Rifle #1 is an odd one.
Its certainly started out as a GEW 98- no other model of rifle that I'm aware of had a lange rear sight.
The big oddity is the lever on the right side of the receiver, which might be a magazine cutoff, which isn't typical of a GEW 98- maybe a custom rifle?
The rear band looks like it has a nail head sticking out of it which is pretty typical of a surplused turk rifle.
I've seen a few GEW 98s that were reworked by the Turks, they sometimes kept the lange sight and had a mish-mash of turk and german stocks and hardware.