Yeah that's the part that i don't know about. But for example, if you say you need a 245/40/18 ContiProContact tire, all of these come up. They all have different prices, treadwear ratings, load ratings, speed ratings, etc. But if two tires are the same specs but "designed" for different manufacturers, idk why the treadwear or any other aspect would be different.
https://www.tirerack.com/tires/tires...m=44HR8CPCXLV2
https://www.tirerack.com/tires/tires...num=44HR8CPCV2
https://www.tirerack.com/tires/tires...rtnum=44HR8CPC
https://www.tirerack.com/tires/tires...num=44VR8CPCXL
https://www.tirerack.com/tires/tires...rtnum=44VR8CPC