Small block gas mileage DD magnum/LA ?

I read that too, but could not find the numbers, and OP is not looking for a more aggressive cam, anyway .......
but looking at the numbers that I did find, yes, the 5.2, if installed right, could have an edge, but there is no way on earth, going on the numbers I found, that I would pull a 5.9 cam out of a 5.9, to swap for a 5.2 cam, with NO OTHER Changes.
Yes! Also, I forgot to mention the LA 318/360 roller cams are the same from what I was able to research when i rebuilt the engine for my ramcharger.