No, the iM is the Auris...The iM was based on the Yaris, so many parts will fit perfectly to begin with. Because the iA was originally a Mazda, I'm not sure if the parts can so easily be transferred over. They may need to spend some time developing them.
Scion and TRD will not, however, sell any parts for the iA sedan. That's because the iA is based on the Mazda2, so Toyota and Scion haven't developed any upgrades for the car. So why does the Scion FR-S, which was co-developed with Subaru. still offer extensive TRD upgrades? Scion representatives explained that the chief engineer behind the FR-S/BRZ was a Toyota engineer, so the company could work on TRD upgrades as part of the development process.