The half nuts ( I think) after looking at them in the last two days may actually be 2.0mm pitch. I bought them some time ago not knowing anything at all about differing threads.
The new m14 x 1.5 nuts are a little loose(side to side wobble), I suggest a squirt of thread lock on the axle, though I have put them on without. In fact i only used one new nut and used one original....... It's a complex thing making e-bike builds. I am currently having the usual rear motor disc brake fitment problem. I have to grind down the calliper fitment adaptor and also mess around changing the amount of disc spacers. I always only have a mm to play with in getting everything in the right place to avoid rubbing by discs or calliper on motor or adaptor on disc or disc on pad,,,,, rant over!