Wikizilla on Twitter: "In GODZILLA: UNLEASHED, GODZILLA for PS3 and PS4, and the main continuity of the IDW GODZILLA comics, the Showa, Heisei, and Millennium incarnations of Mechagodzilla all coexist as different
Bandai Namco's 『ゴジラ-GODZILLA-』PS3/PS4 GAME - Page 312 - Toho Kingdom