Match Current Definition vs. Save Operator Type….

When do we use the former vs. latter?

they do just opposite

both are for unlocked HDAs

Save Operator Type will save current scene version of HDA to otl on disk which it belongs to. It's the same as Accept or Apply on Type Properties for HDA

Match Current Definition will update your scene asset with the definition from otl on disk, so all changes you have done on asset since last saved otl version will be lost, your HDA will be synchronised with the otl and locked

so recommended workflow for locking you asset will be
Save Operator Type
followed by
Match Current Definition

awesomeness.. thanks!