Motorola V620

I bought one of these wonderful phones from MyWorldPhone.com the other day and am looking to add another battery . I see that the battery in my V620 is a SNN5683A, whereas the battery for the V600 listed on the Motorola US website is a SNN5683 - no "A" designation.

Might these be the same battery, or is there a difference due to the V620 being a European released phone?

Thanks for any sharing of knowledge.