Are DeWalt & Bostitch air nailers the same guns?

I'm looking for a 18 gauge nailer. I love my 15 gauge Bostitch and was looking around at different ones.

Does anyone know if the DeWalt and Bostitch guns are the same units?

They are all the same company now... B&D, Porter Cable, Stanely, DeWalt, Bostitch. HArd to say about quality.

Lately, I've seen a bunch of Bostitch tools at Walmart that look like "high end" Stanley. They Also Bostitch cordless tools that look like PC.