The basis for this swap is the transfer case from 95-97 S-10s and Blazers with manual shifted 4x4.
Hey Gavio -- do you remember what year your TC came off of? It seems there is a slight difference between the 95 and 96-97 versions of the TCs... one has a "flat input shaft seal" and one has a "raised input shaft seal"... I suppose the differences can be seen in these pictures:
Looks like the 233 that journey's swaps in has a "raised input shaft seal" and by the looks of it your TC had the "flat input shaft seal"... so it appears either type of TC should work, but I just wanted to flag this in case it matters and someone else has more information about why this does (or doesn't) matter.
Here's the 233 from Journey:
And here's the input shaft from the NP136:
And a nice shot of the rear of the transmission from journey's:
Frankly -- my guess is that if the "raised input shaft seal" works then the "flat input shaft seal" should work too -- but probably not the other way around.
In fact, based on your pictures, it looks like you got one of a '95 -- so my guess is both styles work just fine.