Sigma Lenses for Sony E-Mount! Time Senstitve

[HausOfVass]

I'm sorry for a double post Admins but,

I'm about to leave for a month on a trip, and I was looking at picking up the Sigma 30mm F/2.8 prime for Sony EMount.

Here's my predicament.

There are TWO versions?!

Sigma 30mm F/2.8 EX DN (has a ribbed texture grip)
Sigma 30mm f/2.8 EX DN Lens for Sony E Mount Cameras 330965 B&H

Sigma 30mm F/2.8 DN A (Sleek, no texture, from their "Art" line of lenses)
Sigma 30mm f/2.8 DN Lens for Sony E-mount Cameras (Black) 33B965

WHAT IS THE DIFFERENCE? Their specs look identical but I have no idea...

I work for a cam store but we can't have one ordered in before I leave, and there's a couple shops in my city (Calgary, Alberta) that have one of each.

Any info at all would be greatly appreciated!

Thank you for your time!

- V