It is possible to do what you want WITHOUT touching the PCM/Computer... It will require installing a 1995 internal wiring harness into the 1994 trans, and running BOTH a 3-2 control solenoid that is 10-15 ohms, and also a TCC PWM solenoid that is also 10-15 ohms that is really just a dummy solenoid. It has to be there to trick the computer, but it won't actually be doing anything. What you are over looking... is that your 1995 uses an external neutral safety switch/MLPS, and your 1994 case most likely does not have threaded bosses to receive the MLPS.... So.... working around the computer is one thing... drilling and tapping the bosses (if they are there on your 1994 case?) is going to be another issue.
Putting all that aside.... WTF happened that you destroyed a "rebuilt" unit in two short months? What is wrong with the trans? There are several things that can KILL a rebuilt 4L60E quickly.. Probably the first one every one wants to point at is "builder error, or internal parts failure". The reality is that while that is possible... It's low on the list of probability. WHO installed the trans? If the trans was bought as a carry out unit, and installed by someone other than the shop that built it-95% of the time it is an installer issue/mistake. You might not want to hear that... But that is reality. If the shop that built it also installed it... Then there are several other things that could be happening that caused it to fail so soon. Tell us WHAT is wrong with the trans right now and let's try to work backwards to figure out what has happened so that you don't keep killing transmissions. Here's a hint-problems with MAF, TPS, Engine misfire, MAP sensor, brake pedal circuit or switch, faulty radiator that is compromised inside, and MANY other things DESTROY 4L60E transmissions. GOOD SHOPS know this and when a new job comes into their shop they will spend considerable time diagnosing what happened to kill the transmission. A good shop WILL NOT just put a new/rebuilt unit in and let it go without first determining what killed the old unit... LOTS of ****** trans shops out there that fail to diagnose what killed the old trans and they set themselves, and their customers, up for failure. People that take a trans to a shop and have the shop do a bench build, and then they install it themselves... are just setting themselves up for failure.. why? because they skip the MOST IMPORTANT step.. Diagnosing why the trans failed in the first place. If you can't figure out why the trans failed from the beginning-then you have NO BUSINESS putting another transmission in as you are bound to repeat the destroyed transmission situation again-but this time you will blame whoever built it, when in reality it is YOUR FAULT for not figuring out, and fixing, why the 1st trans failed. Towing, over-sized tires, off-road use, plugged trans coolers or kinked or leaking cooler lines... literally this list could go on for PAGES... But.. people always want to blame the trans builder.. Tell us what problems you are having with the current 1995 trans that is in the vehicle.