UK model compared to Grey import model?

[Luke San]

Hello, just joined up.
I import DEP exhausts into Japan and sometimes get customers ordering DT125R silencers.

Trouble is, the export model, the one officially imported into the UK and the Japanese domestic model is different I think. Most of the customers so far have had the export (re-import?) model so it has been ok.

Does anybody have any info on how I can distinguish between the two? Maybe by the frame number.

Thanks in advance.

Luke