No such thing as a stupid question.

The answer(s) to your question are yes and no. Internal stresses in (CRS) will make it warp and twist whenever it is machined. Hot rolled steel (HRS) does not have internal stresses so it does not move when machined.

Cast aluminum may have low internal stresses so it will not move when machined. Extruded and tempered aluminum and aluminum plate may move like crazy due to lots of internal stresses. Cast aluminum tooling plate is very stable.

It depends entirely on the state of the metal and whether it has been cold worked, worked at a high temperature or annealed.