So, the DMG confirms that Takhisis and Tiamat are the same.
Under the Dragon Orb description in the DMG:
The dragon essence within the orb might want many things: the annihilation of a particular people, freedom from the orb, to spread suffering in the world, to advance the worship of Takhisis (Tiamat's name on Krynn), or something else the DM decides
Is this confirmation that Bahamut and Paladine are one and the same as well? Or if somehow players traveled between worlds (or whatever you might call it), would Bahamut and Paladine be different deities?