That would require starting a database with the purpose of cataloguing every single part number in every single device that exists, which while technically possible, is rather unfeasible without extensive manufacturer cooperation.
What iFixit is doing is the other way around, they are telling what device a certain part number they carry fits in - as in their example, what Lenovo laptop that specific battery is compatible with.

In a perfect world though that information would be available in the repair manual and schematic that came with your device, as they usually did a few decades back. Alas, that’s something that’s never going to happen again because it hurts profit margins.