.85 compressor outlet on 1.15

[crapstang]

I'm swapping the turbo from a 7.3 van into the F250. I doubt this is possible, but I figured it would be worth asking considering the adapter flange is ~100 bucks.
Will the .85 compressor outlet out of the F250 turbo work on the 1.15 compressor outlet on the van's turbo? I believe I MUST buy the .85-to-1.15 reducer, but I am not completely sure.
Thanks