If the hole placement is exactly the same, you should be able to duplicate and bring it over.
You may want to use vertice snapping, make sure you have one active vertice, and do the alignment that way.
I *believe* the vertices were all merged, so at that point you’d want to select all the vertices around your speaker box and hit m by distance to merge by distance.
If your speaker holes aren’t the same between one side and the other for any reason, it’s probably easier just to do the selection by hand again.
Edit: That’s if you actually have a “good” face. I think in your case you just pushed the “good” face below the top edge of the speakers.
It’d be better to make that at least 2 faces, even where it kind of looks right.
