Unmodiified, they can both be shot in SSP Division and ESP Division.
The class is determined by your score on the classifier.
By the way, .40 S&W can be loaded down to 125 Power Factor for IDPA, and compete straight up with the 9mm. There is no point to using full power .40 in IDPA. If I recall correctly, you need a 15# recoil spring in a G35 for 125 power.
http://www.idpa.com/Documents/IDPARuleBook2005.pdf
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