Alan, we have covered this many times in the past, here is one example:
In short, big differences. Suffice it to say that one is NLA.
My point was, that on a Teves III ABS car, if one were to retrofit no-ABS brakes, fitting the correct proportioning valve is also in order. Or Teves IV.
I think the pressure in the lines will different and a proper valve needs to be to be safe (you don’t want all the stopping to be only the front brakes, or worse, to lock the rears and spin every time you press the pedal hard). Perhaps your experience is different, I keep contemplating the change to what you offered me and keep changing my mind.