I don't think they're the same person.
If I was Grav, I'd at least change persona a bit, instead of giving out the same information.
Example: (ooh, I just made a type-oh and found out how to do html fast!)

Umm... *ahem*

Example: I would try and sound smart and never post anything random or stupid until everyone was completely conviced I was my own person.

I've done this a few times, so I should know.