4th partner

Poking around on the Japanese wiki, I found a 4th partner [1] but it seems to be only a clone of Commerce Partner with different looks.

• Different outfit & New Hairstyle
• See Video: [1]
  • Ability to apply the +50% Movement Speed Bonus without having to directly Mount. The "Mount" button still has to be pressed, but the Partner doesn't actually go on the player, which leaves the player free to attack and the like
    • As shown at 2:34, the Movement Speed Bonus is not limited to any area so long as the Partner is Summoned

Also, remember, Japan never had Commerce partner so this is new to them. They instead had Menma which other servers didn't get due to legal rights.

Wasn't Memna just this partner with a different name?

No. Memna was the same as the Commerce Partner. This Partner is different.

By "this partner" I meant "the one we have right now". Sorry for not being specific.

I see, and that is fine. Memna was the same as the Commerce Partner that we have now, except for different looks and outfit.

This one seems to be more useful if everything else is the same (as it looks to be).