[Marcello]

The issue is not precisely that there are missiles with the same name but different stats. The issue is that there are different missiles whose stats seems to be written using different lines of reasoning. Example

1) OOB 11 (Russia), weapon 142 (9M311 Tunguska), various users (unit 405,406 etc.)
WH size: 9
HE penetration: 9
HE kill: 9

In the real world is a radar guided missile with a 9 Kg warhead, supposedly with a fairly elaborate arrangement for causing maximum splinters

2) OOB 6 (France), weapon 242 (Roland II SACP), various users (unit 55,57 etc.)
WH size: 8
HE penetration: 4
HE kill: 4

In the real world is a radar guided missile with a 6.5 Kg warhead, supposedly with an elaborate arrangement for causing splinters, albeit it may not be as sophisticated as the one used by the SA-19.

3) OOB 11 (Russia), weapon 143 (9M313 Igla-1), various users (unit 409,758 etc.)
WH size: 4
HE penetration: 8
HE kill: 8

In the real world it is a Igla series MANPAD. The stats seem to be out of the line with the other Igla (like weapon 75 and 132) which have HE kill/HE penetration around 3-4.

Now, I get the suspicion that in the first case someone read 9 Kg and just put 9 in all the parameters. Whatever it was the missile seems reasonably lethal when it hits (test against USAF F-16s in 2007), as probably it should.The Roland 2 seems unable to bring down F-16s even with three hits on the same plane (tested mutiple times). This got me curious about the various warhead parameters and how they were calculated.