If one side is tightened with load on it and one side doesn't have load on it then it is possible to have some difference. How much I don't know. Here's some info from MOOG:
https://www.moogparts.com/en-gb/blog/tighten-bushing-bolt-on-vehicle-sub-frame.html
Roy
https://www.moogparts.com/en-gb/blog/tighten-bushing-bolt-on-vehicle-sub-frame.html
Roy