Stick with 326mm standard size. 4mm doesn't sound much but if it rubs in the caliper then you'll be in trouble.... the caliper just bolts directly to the hub so you'll struggle to space the caliper out if the disc is too big.
If you're getting 2nd hand brembos, check all of the threads are good and bolts wind through the calipers smoothly before disassembling the current brakes on your car - they are known for stripping the threads.
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