Whats the differences between Oliva G,O,S,V ?

[jepe]

I tried searching or even Google to find that out but didn't find any answer.
Is there a huge difference between them?
Especially between G and V maduro?

 

[Bsneed51]

http://www.olivacigar.com/cigars_oliva.aspx

Here is a breakdown of each of their cigars.