I dont think the clutches changed across the 2nd Generation Escorts LX's. You can do a quick check yourself. Go to
www.rockauto.com, put in your make, year (91 or 94) and model, and check the part numbers for the clutch kits for the different years. I think they are all the same part #. The square teeth on the timing belt & pulleys means the engine came from a car made before March 31st of 91. I have an Escort made 10/90, so it came with the square toothed timing stuff. While I had the motor out, and since I had everything in ''round tooth" but the crankshaft sprocket, I changed over to the round toothed belt system. The Ford dealer had the crankshaft sprocket for $16; the auto parts placed didnt show it in their listings. Prices that cheap for Ford engine parts worries me that they are dumping old inventory that they wont re-stock.
The 91 engine may have a different routing for the EGR tube than a 94 did, but you can just use the 94 intake manifold (at least its EGR setup), with the 94 exhaust manifold. If you have a 91 catalytic converter, it will have a hole in the upper part of the pipe just before it bolts to the flex pipe - as that is where the EGR tube ran in the early 91's, running down behind the motor from the intake manifold. Also be sure to use the dipstick that came with whatever dipstick tube your motor winds up with. The early and late style dipstick tubes came up in different directions, and I think the dipsticks were a somewhat different length w a different part number.