Using different versions of the same dependency like Rust

I don’t think it has to be limited to private/internal libraries. The APIs will be incompatible, but one could write a compat package to map types from one version to the other, or it may just be that the particular parts of the API that are incompatible are not actually used together. Again, from all my internet searching that seems to be what Rust does (e.g., it produces errors like this: https://stackoverflow.com/questions/78298605/rust-duplicate-dependencies).