The machine you linked to that you said you purchased is different in these aspects:
W2 tube (avg about 90 watts) vs W6
Different Power Supplies for the Laser
Cabinet design (although both seem rather short in height)
Laser tube extension housing
Different Rotary styles
Different chiller capacities
(other things as well)
I do take note on both machines opportunities of improvement. Cabinets are too short. Belt drive on gantry would be better if geared. Optics, etc. But both look to be great machine for the money!
Example of headache (ask @Sasquatch):