84244656 fits all 2017+ ZL1 according to this:
https://www.gmpartsdirect.com/oem-pa...embly-84244656
84240348 fits all 2019 corvette trims (stingray thru ZR1) according to this:
https://www.gmpartsdirect.com/oem-pa...embly-84240348
They have different part numbers and form factors, thus I presume it's safe to say that the ZL1 does not have the ZR1 in tank fuel pump.