I don't know what wood species they are but, and without knowing the pieces sizes, I can see some amazing blanks (for casting or not) coming out of those 2 pieces.
If you were close, I would be saying, come over and I will cut those for you but, that is not possible so, the safest way to get the best of of such type pieces, is to use some regular size pen blanks and a pencil. Put the pen blanks on the top of each piece and orient them to give you the best yield (number) or the best number of full size blanks, as the rest can always be cast.
This way, you can play with it until you are happy with it, after that, use the pencil to mark each blank position however, is better to remember that you have the blade thickness of whatever the tool you will use to cut it with so, remember to leave a space between each blank to match the blade thickness...!
Best of luck...!
Cheers
George