Not sure if the space is much more then the filco, I think it would be a keycap difference that is causing it. A few min in, I am not liking the caps on it that much. They could be better, but for the price I can afford new caps for it.
Comparing to my Das here at the office, the spacing looks to be almost the same. I have compared this Das to my Filco before and they also seemed almost the same (haven't officially measured.) I think it is an optical illusion that makes it appear different due to the red plate. I have seen a v1 Rosewill next to a MF1 (ie almost the same board, even has a filco mj1 controller in it and main pcb in it, mark filco on both), and the Rosewill looks like the keys are spaced further apart but are not. I measured with my friend to prove it. This leads me to think it is the red plate that makes it seem spread out more.