Flexplate is not fits the torque converter

Hi, contacted the magnumswap and looks like I have the wrong torque converter. What I have is "Torque Converter, Saturday Night Special, Mopar, Torqueflite 727, Each" TCI Saturday Night Special Torque Converters 141500. that's why flexplate ATP-Z332 is not fits my combo - Magnum (now have no doubts) and 727 transmission. Now I want to try to install the original toque conv from jeep grand Cherokee, I've checked at summit - B&M Tork Master Torque Converters 10417 - this one is fits both - Torqueflite 727 and 46RH. What do you think, can I swap my TCI Torque conv to this one 46RH? In this case I'll use the ATP-Z332 flexplate and HOPE that vibration will go away :)