I know this is an old thread but I just came across it.
Veteran Pave Crew Chief here.
Pave Low was the air force version of the 53, which were J and M models most recently until being retired.
Sea stallion, D and E models are Navy/Marines and it's been awhile my memory is fading but one or both had canted tail pylons. The D had extra large sponsons for fuel while the E had similar sponsons and auxiliary fuel tanks to the Pave.
Us Pave guys always wondered why the AF didn't upgrade to the E as it was practically the same with the exception of mor