+1 I know Jimmy has recently tried to name all this stuff with separate models. However, I find it easier to think of these basses similar to Sadowsky. With Sadowsky, there's the Modern, the P, the Vintage and the Standard, and then you can do whatever you want within those general categories (pickup placement, fancy wood tops, different wood combinations, etc.).
With Jimmy's basses, I think of them as an LM (classic ash/maple/70's) and an LG (classic alder/RW/60's), and I guess the RA (which is kind of a specialty spec based on that late 60's/early 70's transition), and of course the P.
Then, you can do whatever you want... 60's position on an LM, 70's position on an LG, RW board on an LM, fancy top with or without guard on the LG or LM, 5 string, 4 string, bent plate bridge, etc., etc.
Once you start trying to name all those combinations (again, other than the RA, which is meant to be a special spec I guess), you can quickly go crazy!