No, you do not.
In both cases, YDL and Zerogame might install stuff that uses one resolution or another better, but in neither case does it install ONLY stuff for your current resolution. The resolution you select when running the Yellow Dog Linux installer is just for the installer itself. You can set your YDL install to any resolution and Zerogame will adapt to it.
So no... no need to reinstall anything for just a resolution change.
