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Howard
Reynolds were very helpful. turns out the rims are from different manufacturign periods:
Thanks for your questions. The visual differences you see on your Attack wheelset are due to manufacture dates. Both rims have decals from our 2012 season. You can easily tell rim manufacture dates by the first 4 digits on the serial number label in the tire channel of the rim. Serial number sequence HZ 09xxxxxx was manufactured in 2009; HZ12xxxxxx was manufactured in 2012, etc...
Your front wheel was probably manufactured between 2011-2012 as it has a more modern braking surface called CTG. CTG is still used on Reynolds rims for 2016. The 3K 'weave' fabric material dissipates heat more easily than earlier rim designs.
Your rear wheel was probably manufactured between 2008 - 2010. It has a braking surface of 'Uni' (unidirectional carbon) covered in a material called scrim. That material added durability to the wheel, but wasn't as efficient as CTG against heat build-up.
I will contact the seller and as he didn't mention anything regarding it being a mixed wheel-set and see what he says...
regarding wear on carbon rims. when do you know they are knackered?!! thanks!