small whale jaw bone?

[Rowboater]

Hi @Boesse, calling on your expertise once again.

 

You previously described a bone I found:

"The largest element is a partial squamosal bone of a baleen whale - the 'rounded blunt projection' is called the postglenoid process, and the flat surface on one side of it is the glenoid fossa - otherwise known as the jaw joint."

 

Recently about 50 feet away from the first I found a second, smaller and much, much lighter.  To me it seems a smaller mirror-image of the first.  (Hopefully it is not a cow bone).

Comparing the two:

 

 

 

 

[digit]

Well above my pay grade (and many others here). This is a question for someone like @Boesse if it can be answered at all. He's our topic expert with the most cetacean experience of anybody I know.

 

 

Cheers.

 

-Ken