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I am about to make one for a walnut stock, and if i am happy with how the pattern works out I may be willing to make some more for anyone interested... My supply of walnut is somewhat limited, but have lots of birch.. Would make cutouts that would require slight final shaping to fit in your stock, i.e.: some light sanding... will post some pics when i have mine done...
Functional differences, no. Birch was the U.S. military's secondary standard for M1 Rifles. It's just not as pretty.
Beech was a secondary standard too. Both are far harder than American black walnut. There are walnuts that are harder than Birch though. Here's a list if anybody cares about it. http://www.workshoppages.com/WS/Misc/Wood-Hardness-Chart.pdf