Oden doesn't have his swords with him, those are different.
Ok, after looking at it closely, this really seems to be the case.
I still think that Oda wants to suggest his readers, that those are Enma and Ame no Habakiri (one white, one black), while also basically giving them the clue, that they aren't the same, when looking closely.
Which can also lead to the conclusion, that this "Oden" himself might also not be the guy, that he looks like at first glance.