Of course, the Delta ball faucet is so old that the patents have expired so there were knock offs. I am not aware of anyone make actual ball type faucets anymore, but they might. Several OLD brands ( Valley, etc) picked up on the seat-and-spring design, and that is still the case. Kohler, Sterling, Pfister, to name a few.
For kitchen and bath, the lead laws have driven most brands to ceramic. For showers, since there are about a zillion combo mixer/balancing cartridges made in china, that is the design of choice for many brands of showers. It has become very difficult to ID faucets and showers for that reason.
And there are many "designer" styles made by well known, and lesser known, brands labels who put their trim onto a valve body furnished by others.
What exactly is the root of your inquiry??