Difference in Gen1 vs Gen2 intake manifolds?

[MadMaxx]

What were the differences? How can I tell a gen1 from gen2 manifold by looking at them? Can a gen2 fit on a gen1 motor?

MadMaxx

 

[MadMaxx]

Looks like the only thing is the bolt pattern.. no visual distinction

Crap... shot in the dark.

James