Not exactly sure what you're asking, but:
EM1 is the chassis code for a USDM (USA) Si or CDM (Canadian) SiR.
EG6 / EG9 / EK4 are the chassis codes for an EDM (European) VTi.
Both have the same B16A2 motor. Some VTi's also had a B18C4, but was uncommon I believe.