Physical copy when already owning game?

Hello, I’ve bought Overwatch (Standard Edition) online and have been playing it for some time. Now I want to buy the Legendary Edition as a physical copy because I like the game and I like physical copies.
Will it work to upgrade my current game with the code I will get (since I’m technically not upgrading it, but buying a whole new version of it)?

You should contact the customer service to be sure but I’d say since you can redeem the code of the physical version, it should work, just not 100% sure.