Nope, that's not what I want to do. That just resets the colors back the default colors.
What I want to do is set the 'background' of 'Matching brace highlight' to '*default*'
Then if I change the background color in 'Default' to blue, the background of 'Matching brace highlight' will also become blue instead of staying white.
I think my request is not possible for now

Syntax theming in Codeblocks is still one of the things that suck :/