Question on headers/stock manifolds

I have a 2006 4.0 4wd ext cab I recently put DT LT's on because the front cats went bad. (not nearly as easy a job as some make it out to be especially if you are the lone ranger. Just getting your arm in to blindly disconnect and reconnect the 02 sensors is a major pita. Lots of $ in the swear bucket that day). I am considering buying a 2010 cc 4wd with considerably less miles and selling the 06 and wondering if the headers and stock exhaust manifolds will switch right over between the 2 vehicles?
(I am SO not looking forward to doing this again. My arms are just now recovering 6 weeks later). It certainly felt as if I lost some low end, but gained a little up top, but after several checks it seems I gained about 1-2 mpg's so I'm using that one to convince myself to grit my teeth and this time find a bud and tackle it again.
I also am considering an SC in the future and am curious what the gains are with the headers and a catback when installing an SC? Thanks!

 

Yes, they will work on both, no header changes until 2012+ models.