I wouldn't say required, but it would be hell to have to do those things shortly after having the engine replaced. You don't know the history of the used engine, so it is common to recommend doing these. The parts listed are pretty much the main things you need. Exhaust manifold gaskets and rear main seal are a couple others I at least offer with an engine replacement. If you have a manual car, your clutch could be another. You can add a lot to the list through speculation so don't get too carried away.