I think they are 100 % compatible, back in the 80's I replaced my Verticle gate with a new Hurst Competition plus shifter and new from mopar stock 4 speed shifter rods and an NOS Pistol grip , I still run this unit....... I could be wrong but the difference is the shifter is a bolt in on the Competition Plus and the there are two bolts on the mechanism for fine tuning that are not on the original shifter mechanism ........
Correct me if I am wrong that the way I remember it but its been 28 years......