2G intake manifolds: more than one?

[turbotalon1g]

I have 2 2G intake manifolds here and they look different on teh outside.
One has a smooth plenum and one has the ECI Multi plate on on it.
The smooth one also has extra bolt holes to mount something under the plenum.
Apart from that they look the same, so did they make 2 different kinds or are they 2 diff. manifolds?

I'll snap pics in a bit here.

Thanks