Hey I wonder If slaughter was playing any of the Vinnie Vinncent songs live and is there maybe any audio ? I know that they hated Vinnie but damn they were in a band together. Vinnie played KISS songs after he left so maybe this also could happened

No. The closest thing was mark playing the gold rr v reissue and burnin bridges a song about vv.
I know are friend brainsaw would disagree but on the stick it to ya tour a
I would say only 1% knew vvi and no one knew their tunes. Also slaughter had a very commercial audience who would have not known a great deal about heavy metal history. Even you regular kiss fan wouldnt have known a whole lot about vvi back then.. it waa the info world we have today.
That said mark introduced burnin bridges by saying "you all know who this song is about " even though it was clear very few did even at a kiss show.

I BELIEVE that sLAUGHTER played Lick It Up at some of their shows throughout the years.
I saw them in 1995 when their entire set seemed to be mostly cover tunes . I remember them playing Rocky Mountain Way by Joe Walsh.
That should tell you something about how proud they were of their own songwriting.

My only experience of slaughter is first album and tour.