I think it’s cleaner to have both routes the same, the routes were never different enough to be a selling point in itself, the main difference being the live comentary vs recorded multi language commentaryThe Edinburgh tour has the live tour guide, and the city sightseeing has the multi-language commentary. But I agree they should be slightly different. Up until now the Edinburgh tour has also gone round the new town via Charlotte sq. However I don't think that calling point was terribly popular.
Going a different way around the back of the castle and greyfriars bobby just made the map look complicated
I’m surprised they’ve cut out the new town though, I recall points of note about the locked garden that only residents can use, and also something to do with painted on windows to reduce window tax being two commentary highlights around there.