Running 200W servos on 100W deives?

I have a yakasawa SGDA 01AS drive that outputs 100W @ up to 230V making .87A

I cane across a great deal on 200W motors @100V / 2.7A that would be far easier to install on my machine without modification. Is there any reason I cant run the motors at half the wattage? Would there simply be a drop in torque comparable to the 100W motors? My fearis that they simply wouldnt work at all.

Thanks to you all for your help in this matter.