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Unless it's a bargain basement brand and quality control is absolutely horrible I'd be shocked if there was much variation at all within the exact same model of shoe. If a particular style and year model of shoe works for you, any off the rack version of that shoe (barring major defects) is going to work for you.

If nothing else I'd expect whatever miniscule material differences there might be are going to get completely overriden by differences in wear from your specific running and terrain pretty quickly.