I'm not explaining what I mean very well I fear --
If there is on the timeline a series of clips -- each with different variations of an EFX applied to them -- would it be possible to copy the EFX of that entire series, and then reapply their EFX to another different series of clips ?
From what I've seen, I think the answer is no. (not certain if it was doable in PS15 either).
But thanks anyway -- this is not something that will be needed very often -- I only wanted it save the time copying each of some 20 or so clips' EFX to their new matching replacement clips. Not a big deal.