They are different. A Typhoon runs a Borg Warner 4472 xfer case, and Blazer has a New Process 233. VSS's are different on the two of them. You need to look for one in a '90-'98 Astro / Safari or '91-'97 Bravada.
The two wires you'll want actually attach to the DRAC; little white box mounted to the ECM. The wires you want are twisted together; they are (light green / black) and (purple / white).
