Im afraid not, because you will chance the colours, as far as I know, if you change those colors it will be for everything. There are few bugs and requests identified about this theme.
Take a look at the article https://confluence.atlassian.com/display/DOC/Apply+a+Theme+to+a+Space
explains how the theme application works, but it respects an inherit. If you apply a Global theme, applies to everything, if you customize, the inherit breaks, and it keeps the own one.
Take a look!
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