I don't remember there being any problem between the RC2 to the RC3 upgrade with backwards compatibility. I reckon it will be exactly the same when the new RC4 units come out. The only time you couldn't use old handout transponders was when they went from Analogue to digital, but you could trade in against the the new system and get a good discount.
I seemed to remember that the Harrys when they first came out were supposed to have this extra digit but it never materialised. I reckon that these new transponders will have a number similar to what we have now but then a 1 on the end, then your second copy will have a two on the end, etc, etc. Now I am assuming that if you used a Percy on an RC3 it would ignore the digit on the end and just pick up the original 7 digits. So assuming that you are not trying to run two cars in the same race at the same time then you wouldn't notice any difference.
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