It's not fundamentally different but I know there are little gotchas in the rules that you wouldn't expect. Like on a weak hand table start you can touch the gun with your strong hand at all. Is there more stuff like that? I don't really know because I haven't bothered to look.
I shoot IPSC and even I forgot about that one. Could have done without that procedural at the Whirled Chute 🤦♂️
Apart from the equipment difference (most USPSA PD guns would not be IPSC PD legal) probably the main diff is the short cut rules.
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