I don't know how VGMdb does this, but I would not consider the US PS2 console game and the arcade game to be the same product.
1. Different logos:
Arcade:
https://web.archive.org/web/20180306...r/jp/am/ddrx2/
US PS2:
https://web.archive.org/web/20100206...olution-x2.php
2. Different themes and menu music in-game
3. The current description applies to arcade only:
Quote:
Redesigned menu's, song selection and introduced personal settings right on the cabinet.
Introduced Replicant-D Action which is unlocked after clearing Extra and Encore Extra Stage.
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