There's pretty big variances in the same batch, let alone years and ohm rating. I've got a buddy who's running through speakers, finding the best out of year groupings and then comparing them. The difference is pretty massive. Even if you get some "Golden Era" 2000-2004 speakers, they will all sound different.
That being said, most of the modern speakers are worse than the older speakers to my ears.. Especially the Chinese made ones. I had an Orange 412 solid plywood with Chinese V30s from 2021 that was way honkier and brighter than my other cabs. I picked up a Marshall Mode Four Straight 412 that had Chinese 2022 V30s swapped into it, it also sounded honky and too bright. I swapped 2 2002 V30s in the Marshall MF412 and it it sounds much better. My other Marshall MF412 Slant has Celestion Vintage 30MF and it sounds a bit warmer and much tamer than "normal" V30s. These are all 16 ohm, though.