using some of one company's product and some of another's, is done all the time.
A pre-fab is a regular shape like a square or a rectangle, so you can also use a Kerdi pre-fab (square or rectangle) and tile it. Lining up tiles so that they are all flush to one another is why you have a trowel with grooves in it. The floor is not a challenge.
Where the walls meet the tray is where water will drip off, and using a pre-fab means you make sure the walls are positioned close enough inwards to ensure water will drip into the tray and not down the backside (outside) of the tray edge.