werehippy
I wish I could find the specific article about it, but it’s like a decade+ old and google isn’t cooperating. If I recall right though, Brave was the first film idea that Pixar put out which had entirely been conceived without the original core team at Pixar’s input. All the other stuff, even if it hadn’t come out when those people left yet, had been brainstormed by that group and their lack of involvement is why from that point on it all feels so much lesser than Pixar’s golden age.
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.