I don't think there is any real scientific evidence on that. My guess is the wild game bones would be a bit stronger due to continuous stress. Free range beef would also fall in that range. That is a w.a.g.!
I will be harvesting some deer and elk bones in a while and hope to test. My first thought was the bones should be very well dried, but then I considered that the original method would have been to use "fresh" bones from the kill. Also, cow bones were not readily available in most areas in the US. Have fun and post your results!
Hawkdancer