It might be possible but I have never tested it.
Theoretically:
In Trainz Content Manager, open the route for edit.
In TransDEM, recreate all the UTM tiles, setting the mode to "overwrite, keep KUID".
However, I am not sure at the moment which criterion TransDEM uses to find out whether a tile exists or not. It could be the entry in the .obs file, it could be the tile object in the edit folder, it could be both. If it is the object in the folder itself, then you would also need to "Open for edit" all UTM tiles affected and move them below the "scenery" folder for TransDEM.
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