pcm conversion????
 

im doing a trans swap on a 2001 ford ranger 4.0 4x4, and i was wondering if i could use a pcm out of another 5 speed ranger, does it have to be a pcm out of a 4.0 ranger, and lastely will the newer rangers even let me just changer out pcms, without flashing it and reprogramming it. thanks for any help.