Aren’t Tissot and Omega the same innards
The Swatch Group owns Omega and Tissot, and a shed load of other premium brands.
It also owns most of the movement makers, like ETA.
So unless you make your own movements, like Rolex, and Omega for certain watches, most watch manufacturers will be getting their movements from one of the main movement suppliers owned by Swatch.
You can get the movements in different grades though, so the more expensive watch may have a better grade of movement in.
In addition Omega tend to rework the movement anyway – my speedies Lemenia based movement is coated in something flash.
Doh – usurped…