If the same ad is being created in standard definition (SD) and high definition (HD), they should have the same code, with one ending in H. For example: ABCD1234000 and ABCD1234000H
There is no additional charge to create the matching code. You SHOULD NOT create a new code as this will charge you for the code and the codes will not match.
The matching code can be created by editing the existing code. See Create Matching SD/HD Code for detailed instructions.