2002 Cummins ISX450 swap

I've hit a wall on figuring anything out on a truck i bought. I bought a 2013 Pete 389 that had the ISX 15 swapped for a 2002 ISX450. the truck runs great until 53 mph and just stops like its governing out, I looked and the governor is set to 68 on the truck. it is throwing just about every emission code. I figured the emissions would have been taken care of with the ecm swap. are the emissions controlled by another computer like the cecu on the truck. any advice is appreciated thank you.

 

No i got it at an auction and now I'm trying to figure out this swap from the back to the front, but this is the first truck I've ever had that has had emissions. i though it would be good to go with the swap but I'm just out of my element. I've always been big on the ol' 3408 but i just had an injection pump rebuilt on one and after going thorough that, i might just have to change my name lol. cat doesn't even make a kit for them anymore.

 

That what i was thinking but it is throwing emission codes. surely the people who swapped it wouldn't have been able to make the isx 15 ecm work with the 2002 isx 450 motor.