My fold of Songbird 1:
Differences:
- S1 is a bird base with grafted toes, Finch base is designed for the 3D body and pleated tail IMHO
- S1 has toes, Finch does not. leg shaping is very similar otherwise
- S1 wings are just crimped out of the tail flap. Finch has individual wing flaps although they are not completely loose
- heads are shaped similarly, but the beaks themselves are different
- S1 spent most of the plan folding out those toes. Finch spent more time on precreasing and pleating the tail.
If you need more resolution, Flickr has both of them a bit larger.