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When you do this, it will ask whether you want to replace existing images or not. So I think you can leave what is already in place there. HOWEVER, when I did it, there were unintended consequences. I chose to replace, and it did. But it also replaced headers for some groups that had been customized. And with a community that has a lot of spaces and groups, I don't know how you could easily test this to see what the outcome would be.