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When Dupont went to the HC7776 and G27779 “4to1” clears i had the same thing. We made the switch and the old clear hung around a few months till the hardener was no good. My Dupont rep told me then that the HC7776 was actually HC 7600, and the G27779 was actually 7900.(some running changes to ’em since 1st intro) The only thing they changed were the activators and that there was absolutely no problem using the “4 to 1” activators to use up the HC7600. I did it and never had a problem. If you’re leary of it use the clear up on the bottom of hoods, inside of doors, etc. I’d bet your clear has yellowed with age a little bit too so that may be best if you really want to use it up. My rep knows i’m tough on quality and redo is the worst of all 4 letter words, and he’ll always err on the side of caution if there’s a shadow of a doubt about a tech question, so i was confident when i used mine up…years ago now.
I recall the HC7600 was the same as one of the Nason clears too but don’t recall the number for absolute certain, so i won’t say it.