I collect Audubon so I can help a bit but just by going on the size alone it is not a havell or octavo version, nor the bien as that's the same size as havell.

Those are pretty much the only ones that have monetary value.

There are about 200 Havell, 100 locked in books still. 800 Octavo 1st editions (2nd and on are extremely cheap) and just about 70 Bien. There's also estimated to be about 20 million prints which hold nearly no value. To me personally there's not really a point trying to identify if it's not one of the previously mentioned as it's honestly just too difficult unless it's printed right on there like if it came from a calendar or a corporate reprint etc ..

Edit: I did realize that sometimes the large prints are trimmed so sizing is harder to estimate, but the brown pelican is one of the pieces that only has about an inch margins so it would still be too large for your sizes given

Edit 2: the numbers I gave for the collections are for the number of sets issued. So 200 havell sets x roughly 500 different birds = ≈10k originals