Question: are godzilla and gamera in the same universe?
Answer: No, they're not from the same universe, it's two separate film studious, and Toho (the owners of Godzilla) really don't care too much for Gamera since it was meant to be a knock off Godzilla. The company who owned Gamera approached Toho back in the day wanting to make a crossover movie and Toho turned them down.