In those shots specifically, the elements are in COMPLETELY different positions to each other in the original and in the recomps. And the quality of the compositing also definitelly isn’t the same.
As for Spartacus - yes, they did the right thing reinstating that scene but then did the wrong thing calling it a restoration - it’s an extended edition. If the BD had a seamless branching choice of either version, then the version without that scene would have been a restoration.