No, pre-load is a specific condition depending on the fit of the balls within the grooves of the screw. There are several ways it can be achieved. Pre-loaded A/C bearings don't mean that the balls are already in place in the raceways, it means that there is some initial force applied to the bearings before any loads are imposed upon them due to actual work done. Hence PRE load. The same thing applies with a ball nut(s).