Only Phase Rotation is important. For the emonTx, the phase that the a.c. adapter uses is always Phase 1. The other two phases must have the correct sequence relative to that. Phase 1 as labelled by your supplier need not be the phase that the emonTx considers is Phase 1.
It is written as clearly as I can in the PDF document that you downloaded with the 3-phase sketch as part of the zip file.