I have two menu items, for example Menu1 and Menu2. Both are a Category Blog for same category Cat1, but Menu1 has some specified tags.
Of course, some articles are present on both pages, and all
url's on both pages look like:
How can I force Joomla! to link articles to second menu item? Or, maybe, how to make links without menu but with category name like:
Have you tried deleting your first menu item and remaking it? Sounds like you just want to prioritise the second category blog menu item and the router is finding the first one first.