I took some pictures of the the 1.6l head and a 2.0 head I had sitting around for comparison.
Some things that I noticed were different:
The intake ports are pretty much the same size when compared with a gasket
The exhaust ports are slightly smaller when compared with a gasket
The HLA is slightly different looking between the two heads, but both heads look to have the same oil holes where the HLA bolts on
The surface of the head where it meets with the block is slightly different as well. The 1.6L head is missing a few ports on the intake side of the head. However the stock head gasket that I have doesn't have these holes the 2.0 head has anyways. I'll let the pictures do the talking.
The intake ports are visually the same on both heads, this is the 1.6L intake port with a gasket for comparison.
The exhaust ports are visually different, the top is the 1.6L. The 2.0 port looks a lot more uniform, however it may just look different because the 2.0 head is still dirty.
The differences in HLAs between the two, 1.6 on top.
Here's the HLAs taken off and the ports underneath.
The combustion chamber on the 1.6L head is visually smaller as well. On the 2.0 head the gasket meets the edges of the combustion chamber all the way around. Here is a picture of the extra material between each chamber with a HG for comparison.
Here is a view of the deck on each head, you can see the extra ports on the dirty 2.0 head. You can also see a slight difference in the shape of the 1.6 combustion chamber compared to the 2.0.
A better side view of the head on the thermostat housing side.
The last difference that I noticed was this, the 2.0 journal looks to have more material.
1.6
Thanks guys really appreciate your input, not looking for any definite answers or anything like that. Just figure this could be an interesting topic, and sort of a way to introduce myself. All opinions are welcome if I wasted money because of my lack of knowledge the so be it, at least I learned something from it!