Little known thing about toilets and ceramic sinks. When I was younger there was a company in the town I grew up in called Alliance Ware, they made both items. Some were sold as their brand, for gas stations and commercial places. But they also made them for other brand name companies like Kholer , etc. All from the same clay, and fired in the same kilns. The only difference was the molds to make them and the slip colors used in the final firing to make them shiny. But to get a brand name one cost quite a bit more.