I looked and most likely overlooked the answer.

I am getting ready to a little machine shop mini mill cnc conversion.
Going to use cnc fusion ball screw kit.
and looking at the G540 motor kits from Automation Technology Inc.

My question is what are the oz difference in the motors?
270 oz and 381 oz

i am thinking it is how much torque the motors apply.

What sizes would be recommended?

I plan on ordering the mill and controllers this week.
Have all ready order the ball screws from cnc fusion.