* Transmission Type: You need to know the *exact* transmission type in both trucks. Ford used several different transmissions in Rangers during those years (e.g., M5OD-R2, A4LD, etc.). Simply saying "automatic" or "manual" isn't sufficient. The transmission identification codes are crucial. They're usually stamped on the transmission case itself.
* Engine Compatibility: The transmission must be compatible with the engine in your 1993 Ranger. A transmission from a V6 might not work with a 4-cylinder engine, for example, and vice-versa.
* Transfer Case (4x4): If both trucks are 4x4, the transfer case compatibility needs to be considered. These can differ even within the same year range.
* Bellhousing: The bellhousing (the part that connects the transmission to the engine) might have different bolt patterns or dimensions between the 1993 and 1997 models, preventing a direct fit.
* Wiring Harness: Especially if it's an automatic transmission, the wiring harness might need modification for compatibility.
In short: You need to verify the exact transmission codes of both trucks to be sure. If the codes match exactly, the chances are higher, but even then, a professional mechanic should be consulted to ensure compatibility before installation. Simply assuming they'll interchange because they're both Rangers is risky.