I have previously compared some of the models in terms of specs, and most do vary. In the past I've compared various SX2 size models, and the G0704 sizes.
Things like slightly differing amounts of travel in axis, different spindles, different spindle motors, and even machines with very similar specs look visually different in photos.
I suspect lots come out of the same factory, but they all get customised to some extent for each purchaser.
.
John probably knows these machines far better than most on here, especially Sieg machines.