Matching your tiles will be the problem though in most cases.
Replacing shower pan in tiled shower.
Shower pans are made to work with fiberglass shower surrounds and tiled walls.
How to replace a tiled shower floor.
If your shower has a shower pan replacing just the pan is possible but not always advisable.
Ceramic tile showers that are properly built contain a waterproof barrier shower pan liner under them that catches water transferring through the tile floor and directs it down the drain pipe.
Improperly installed shower floors can allow water to seep through the floor causing cracks or failure of the tiles which results in water leaking below the.
They fit on the floor inside the shower and act like a tub keeping water off the floor.