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!
More and more people are building their careers with Atlassian, and we want you to be at the front of this wave! Important Dates Start the Certification Prep Course by 2 April 2019 (you can also ...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs