There is none. Like genuinely, not being facetious or cruel, I just genuinely see no difference whatsoever between every non-biphobic definition of pansexual and bisexual. But hey, call people what they want, as long as it genuinely makes them feel loved, versus them identifying that way to be unique from x group or label.

I couldn’t say; I don’t identify as pansexual, I’m afraid. All I can speak to definitively is the way that bisexuals define themselves and have defined themselves for decades.