Why are you "trying this again?" You were GIVEN the correct answer. YES the Magnum flex plate has the proper weights for the matching engine. A Magnum is balanced DIFFERENTLY than an LA so you can not use LA based weighting. A 5.2 mag flex plate and a 5.9 mag flexplate are DIFFERENT so you must use one FOR a 5.9 magnum.
In your other thread, I don't believe you mentioned that you have a neutral converter
Please do not start new threads on the same subject. It confuses the issue Sometimes, there are details in one thread, not presented in the other.