TK, he hasn't got back to me since I e-mailed him, through eBay, the 2nd time. I will start a dispute if I need to, eBay seems to like you to try to resolve it yourself.
When I unwrapped the drive side crank I looked inside the taper, instead of uniform flat contact patches where crank tapers fit, the contact patches have 4 grooves where corner of crank tapers have dug in. This has probably been caused by the bolt being loose and cranks being pedalled. Obviously this affects how tightly the crank fits on BB taper, not tightly in this case.
I also thought about JIS and ISO, so checked last night. It's got nothing to do with it.
The fact that there is a difference in fit of the 2 RaceFace cranks compared to each other when they should be the same shows the drive side crank taper is damaged/spread.
Later today or tomorrow I'll pop into the LBS and ask to try the cranks on several new and used BB's just to remove any doubt that there is something wrong with crank.