I have an AV123 X-Statik that is currently undergoing an upgrade, as well as a GR model that is replacing the one I lost from shipping damage. The differences between the stock crossover are mostly down to parts quality and the lack of a crossover board, since theyve since been sold outfor a while now.
Drivers are identical, aside from the shielded woofers in fhe upper section on the AV123 units.
There's a couple small changes to the cabinet plans, mostly in converting the original metric measurements to "freedom units" amd the front baffle being a long 1.5" thick vs the more current version which is slimmer, and is both bolted & screwed in place.

That said, the stock X-statiks are great as is, tho upgrading them is pretty easy if you only want to mod the stock crossover. Esp if you only plan to upgrade the crossover. Removing the stuffing and excess glue to install norez is an absolute pain...

My crossover vs the stock boards.