I've seen that Noesis already supports the 3D Models from FFIII on the PSP as its file format is .gmo and several square Enix games use this same format on the PSP, however on the Nintendo DS these games use a format called .NMDP, Square uses this for several FF and FF related titles on the NDS, and it appears as though the format doesn't change at all between games.
I've extracted them from the LZSS compression and have the bare .nmdp file here, I've compared the nds extracted file with the exact same file from the PSP version to see how similar the formats are, and from my not so great guesswork, the format isn't too different all the file naming is the same inside, and neither appears to be compressed at all.
Below is a screenshot comparing the 2 formats, there are some differences but also a few similarities.





