I'm reinstalling Morrowind onto my computer (MGSO recommends a fresh install, so I'm playing it safe), and I realized I have a North American version of Morrowind and Tribunal, but a European version of Bloodmoon. I've installed them together before, and it worked fine, but I cannot remember if I need to use the North American patch or the European patch for Bloodmoon for it to work correctly. Is the North American Bloodmoon patch for North American versions of Morrowind or of Bloodmoon?

You have to use the North American patch for Bloodmoon if you are using a North American Morrowind.