The only bodies that are not included in this comparison are the Pureneemo M body with LL bust and XS boy body.
All of the dolls in this comparison have the newer Flection Full Action body, which has upgraded shoulder joints that allow better range of movement. There are a few different versions of the older bodies, but they should be pretty much the same in height as these new ones.
Here are the Pureneemo bodies by themselves. You can see that besides the height, also the bust size changes a bit.
I took a closeup to compare the different busts. Here you can see the "standard" bust each body comes with, but you can change the bust parts between the bodies if you wish.
Here are a few other things I thought I could mention:
Pureneemo heads can be put into any of the bodies, though the larger heads might look a bit bobbleheaded on the XS body.
Picconeemo S heads can be put on the M body.
Picconeemo D heads don't really look good on the S/M body, and vice versa.
:: HANDS ::
Pureneemo S, M and L bodies can share the same hand parts, but the XS body has its own, smaller hands.
Picconeemo S and M can share the same hand parts, the D body obviously has different ones.
:: FEET ::
The feet size of different Pureneemo bodies looks pretty much the same to me, so I'd say they can share shoes.
Picconeemo S and M have the same feet size.
Picconeemo D can't share shoes with Picco S & M, but some Pureneemo shoes might fit them (and other way around).
Hope I didn't forget to mention anything! ^^;
Feel free to ask if there are any further questions ^^