How do I tell a 5.2 from a 5.9

Ok, I also checked out a site called Magnumswap.com and found this

"Identification
All Magnum engines are stamped either 360 or 318 on the driver’s side near the rear of the block. The casting number found on all 360 Magnum blocks is 5302006, whereas the 5.2/318 Magnums are 53006714 or 53006657. Otherwise, the 5.2 and 5.9 appear pretty much identical."