Physical DF edition - what happens if i buy digital preorder to play on launch day?

[Chronormi-outland]

There’s a blue post about that

@Kaivax

For those who would like to enjoy any advance content or their digital items before they receive the physical Collector’s Edition, they can purchase one of the digital options available and upgrade their account to Dragonflight immediately. After the Collector’s Edition is received, the code received in the box can be applied to the account they would like to upgrade to the Epic Edition of Dragonflight. Doing so will result in an automatic credit of Battle.net Balance to the associated account in the amount of the cost of the original digital purchase.