Integrated handlebar and Giant frame compatibility

[weazel]

Hello I own a Giant TCR Advanced 2 2017 with OnDrive head tube (1 1/8) with alu Giant Connect handlebar and stem. As I'd like to replace it with a carbon integrated handlebar, the question is, is any other brand compatible with it? What i mean is that what is straight below the spacers is the so called OD road headset and I wonder if it can be freely replaced or covered by the cap that is part of the new set. I'm especially interested in Canyon CP10 or Black Inc and the likes.
Thx for your time.