Thanks for the advice HankMcSpank and richie00boy

Searching for ball screw in the title/description or 3040Z really reduces the result set. Think I will probably go for a ballscrew from the start.

It looks like the newer/'updated' models have a black control box, like the ones on Yoocnc 3020 3040 6040 series - carving-cnc.com. Some even have YOOCNC written on them in the pictures.

Good to know that I should expect to want to / need to replace the stepper driver boards at some point.