Different LCA's?

If you do that and get the same measurement on both sides.......Level the car up at the frame rails at the torsion bar cross member side to side. Then measure from the very front of each frame rail to the floor and see if that's the same.
I assume what you're getting at is to see if the unibody is square. Right now, I have jack stands under the frame rails and have the driver side torn down so I could get the LCA out. When I replaced the K-member, it went in without issue so assumed the unibody was straight.