Okay, those two images are the old and the new spindle?... okay, can see the 800W and the new 1.5kW - makes sense.

The bit that's confused me is that these are 400Hz motors, and the image from the VFD that you provided on the first page of this thread shows that the VFD is rated from 0~300Hz. And the best I can tell from a close-match on the part-number to the NowForever A100 manual (pdf randomly found online) - that's likely rated at around 750W.

So... I have to ask... who's provided the replacement spindle - was this the original machine vendor?, your last post or so was talking about going back to supplier for a replacement machine?, spindle? If so, did they just supply the 1.5kW spindle?