I suspect they are EY’s reverse engineered equivalent of Gibson TB+ pickups placed in an Epiphone shell. There’s a lot of science and art to reverse engineering pickups. You can use the same type of magnets and wind wire around the bobbins to get the same resistance but that’ll only get you in the ballpark.
Is the magnet material the exact same size and material spec with the exact same power? Is the wire the exact same spec material, gauge, coating? Is it wound in the exact same pattern with the same number of wraps?
If EY did their homework and didn’t just use ceramic magnets with enough wire around them to match Gibsons resistance values then they should be very close. If they didn’t then it’ll probably be more like their China Buckers, which aren’t a bad pickup at all for the price, but don’t reach the sound quality of Eppi 760 ProBuckers or the new Gibson NR pickups.
One thing this EY offer does do, is give a potentially upgraded sound to standard and Goth Epiphone models with the convenience of a drop in replacement. That’s something that is sorely lacking in the Eppi upgrade world. Also, important to note, the Goth bird (and possibly other Eppi models) use the exact same pickup spacing as vintage Gibson birds. So if these replacements are truly spot on Gibby sounding pickups it should sound every bit as good as the 2013 Eppi CP, which had Gibby pickups in vintage (not modern) Gibson bird locations. And that right there has me thinking about buying a set to try in one of my 3 Goth basses.