2wd5spd

I've recently been looking at a set of headers for my truck. It's a 2000 f150 with a 4.2l v6. Ive read in many different places that the 3.8l mustang motor and the 4.2l motor are very similar and some parts are interchangeable. My question is, will a set of headers for a 3.8l fit on my 4.2?