The vendor.xml just stages the phone with the carrier's preferences that released it. All OS's are compatible with their intended model regardless of the vendor that you have or that is releasing it. With that said, if you want to load an OS released by any other carrier than yours you will need to rename or delete. There is not other way around it.
If you don't delete it and it's not from your carrier DM will state their are no updates available.
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