No, not directly. All 1152 S90 XS Normal Voices and 65 Drum Kits are already apart of the MODX as Single Parts among the 2195 factory programs... so you can certainly reconstruct any S90 XS/S70 XS Performance, but there is no way to directly load a S70 XS Performance to the MODX.

If you are looking for a Factory Preset Performance, check the MOTIF XF PERFORMANCES file... Yamaha has converted all 512 Motif XF Performances to MONTAGE/MODX format — available for free download from the MODX Product Page on the Yamaha.com corporate site.

If you are talking about custom made Performances, you have everything you need in the MODX to re-build them in the MODX.