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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
I am not sure of the seo implications, but I would do everything I could to keep 1 installation if I could. It just seems like it would make management a lot easier. I may not be following what you are asking though. It sounds like you have a site without a blog using 1 worpress theme and then you are wanting to add a blog using another wordpress theme, is that right?