Difference between S-300V and S-300PMU-2/3

[Shadowalker]

Ive been doin a bit of reading on the russian SAM systems and i dont quite understand the difference between the S-300V and S-300PMU systems, they seem almost identical, fulfiling the same functions, only the manufacturers seem different. can anyone tell me what the difference is?

 

[rOk]

eerm...difference in range, operational height are the first ones that spring to mind.
The western designations (SA-10:SA-12) also suggest that the SA-12 is more recent (duh ) and thus more capable which infact it very well may be with it's rumoured ballistic missile intercepting capability.

Just off the top of my head...I might be wrong (but I don't think so )