Well, it’s 2023 now, and this just happened to me. Style sheets in both documents were based on No Paragraph Style, but when pasting from one file to another the font changed from Franklin Gothic to Minion Pro. I went into the original file and made the change from David’s article and it fixed it.

Thanks to the group for this solution. Major time saver.

But if this isn’t normally a user-accessible setting, and I can guarantee you I’ve never dug into the code to change this, why would one doc be set to Minion Pro and the other be set to Franklin? Why bother carefully basing style sheets on No Paragraph Style if that can be overridden by something buried in the code? It’s infuriating.