[Absolution]

Minor inconveniences. ( I foresaw some of it but my brain decided to look the other way)

While the stock turbo's compressor side is gtp38 based along with the newer style flange. The exhaust downpipe flange is tp38 based.
Why does this matter? The stock down pipe won't let the new turbo drop in and work.....

TP38 sleeves the downpipe into the turbo exhaust flange.
GTP38 Sleeves the exhaust flange into the downpipe.

Without me being there, I'm not sure about my father crawling under truck to do it to swap out to the new downpipe I had ordered. He said he could swap the turbo and I was already worried somewhat about that.

I'm probably going to call him today and have him to take it to a shop local for the downpipe and just have them temporally clamp the 4" downpipe to the old turbo if he really wants to do the turbo.

I guess an expedient thing to do would be grind off the mating lip on the newer style if you couldn't replace your down pipe. You could also try to take a Dremel and cut off the lip on old style down pipe but that pipe is pretty hard and you'd be there for a minute . - For the skoolie people

Uploaded are photos of the GTP vs TP exhaust.