The Valencia orange is more like a family of several similar oranges currently. Citrus can "clonate itselves" via seeds, so a Valencia orange in California and other in Florida can be the same plant, or have almost equal (but not identical) genetics. Is complicated to explain.
When you talk about a Valencia orange in Florida now is often the clone SPB-1-14-19, sligtly hardier than the original tree from California and different also than the Hughes clone if I'm not wrong.
Producer on the other hand is not the same as hybridizer. The original tree was developed in California but is cultured in all suitable areas of the planet. Their patent has expired long time ago