I thought it was the other way round... That GP5000 areslightly less PR and also slightly less rolling resistance.
The GP5000s are supposed to be better than the GP4000s for both puncture resistance and rolling resistance. Adding tubeless into the mix complicates it however and they've updated the tubeless GP5000 since they first came out. The new ones fit hookless rims, have two layers of material instead of three, are lighter and claim to be simultaneously lighter, faster and more puncture resistant. They are billed as tubeless ready instead of tubeless, which appears to meant the new ones need sealant, where the originals didn't.
That review I linked said they didn't deliver as much of an advantage as they expected, and they particularly question the puncture resistance.
I'm happy with the first version, slightly reluctant to stake so much on a tyre I've never tried before, particularly if I could get another pair of the first version.