Could the planned Ersatz Monarch class defeat a Kongō-class battlecruiser?
Short answerYes. Ersatz Monarch was capable enough to defeat a Kongō.
NotesThe question tests the planned Austro-Hungarian ship against Japan's Kongō class. Unlike the lightly protected España, which could merely force Japan to deploy a Kongō, Ersatz Monarch's heavier design could plausibly win the engagement. Ships grouped outside the largest naval powers could still occupy very different combat tiers.