Never said it was. The 7.62X39 was developed from a very similar German cartridge, the 7.92 Kurtz (Kurtz meaning "short"))
BTW, I have had one for about 12 years now. Don't shoot it much anymore, having moved on to bigger things (7.62 NATO as a matter of fact) and smaller things also (.30 Carbine) :)
Sorry for not clarifying...
On your part, I was merely adding additional thoughts.
Somewhere else in this thread (the article maybe?), an SKS was mentioned firing a 7.62, which is not ENTIRELY accurate.