The MRT PTx does use the same number system as the AMBRc system, and MRT do not 'possess' any numbers. Only AMB know which have gone, and which to use, therefore a clash could happen between an AMB transponder and a MRT transponder.
However, there are 7^10 possibilities (282475249) for the PT number (7 places, any one of 10 numbers can fill each space), so incredibly unlikely that there would be a PT clash. Even then, there are only 10 per heat, and 10 per final, so at a meeting, it would be unlikely they would be in the same heat, and race control could probably work around it.
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