never tried, I do know the ZL1 will fit on SS but not sure SS on ZL the ZL does have quad tips where SS are single (up to 2015 16 and newer SS are quad now)
that said, what you mention about smaller diff may well apply
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1969 RS Z/28 302
1969 Firebird LS6-6 speed TA clone
2015 Zl1
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