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I was wondering if you can switch the shower and toilet since they both have a large pipe in the slab? Can you switch the sink area to a tub, since those pipes are the same size going into the slab?
The shower drain has a trap and the toilet doesn't, so you just can't switch drains
And also to add to ed21's, the two drains are different diameters.
You could relocate the fixtures, if you dig out the old plumbing and re-do the rough plumbing. But is it worth the trouble and expense?