User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-184.38.5.102-20130112235558

Well,I don't know about anyone else,but I found one difference between the 2nd Gen and 4th Gen Gendrome.

The 2nd Gen Gendrome has 4 claws(one of them being a sickle-shaped claw) on it's feet.

http://images.wikia.com/monsterhunter/images/b/b6/Gendrome.png

While the 4th Gen Gendrome has 3 claws(the middle being sickled-shape).

http://images.wikia.com/monsterhunter/images/c/c4/Gendrome_MH4_Render.png