Pre-magnum flexplate on a 46RH?

Professor Fate said
Assuming (!) they want you to use the LA 360 balancing (the 5.9 Magnum is different), you would need an aftermarket flexplate like the B&M 10239

The tech said pre-magnum balancing, so I'm pretty sure your first assumption is correct. But would a flexplate like the B&M 10239 work with a 46RH?

Professor Fate said
That depends on whether the A518 flexplate was on a 5.2 or 5.9.

It's from a 5.9