Do ring sizes differ based on different compaines?

Okay so my boyfriend told me he wants to know my ring size before Christmas 🙈 I was curious.. if I go to any store and get a ring finger size, will it be different if he goes with another companies product? Idk how this works and need help!! I know like my jean size is a certain size at one store and a different one at another so I’m just curious if it’s the same with rings

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