If it is, you can shim it, but in practice the cages aren't usually so tight that the extra 1.3mm is a deal breaker.
Shimming the sprocket defintely work, which is my current method with a 10 speed campagnolo derailleur on an 8 speed chain.
@edscoble started
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Shimming the sprocket defintely work, which is my current method with a 10 speed campagnolo derailleur on an 8 speed chain.