slight differences in the heigth of either trem post won't matter, in fact i never got any negative results with differences of up to 1mm (ish) which i think is a full turn of the post in its thread.
However, i only tried different heights as an experiment to see if it could contribute to tuning problems, then put them back to equal height.
All my
floating bridges are adjusted so the posts are equal height (by eye - i don't accurately measure it).