The pete in the addon is not a 379, its a 378 because the hood is shorter and more sloped while on a 379 its longer and not sloped. The interior of the pete in the addon is from a Peterbilt 386 (Aerodinamic truck) but the interior in a 378-379 2006 to 2007 is different (Look it up)
The steering wheel is the same, pretty much the rest of the stuff is the same (except there is no sleeper).

-----I ONLY DID THIS BASED ON WHAT I THINK ON WHAT NEEDS TO BE CHANGED AND IS BASED ON MY OPINION-----