I googled it. Here is what I found.... From the Shootersforum.com "It's my understanding that the differences between the Hawkeye, and the MKII are in the metal finish, the stock shape, and finish, and the trigger. Otherwise they are the same gun. The new trigger is a better deal for a couple of reasons. Old stocks should fit since barrel contours, etc. have remained the same to my knowledge." "
Originally Posted by My3KidsDad
Do you think the new Hawkeye stocks will fit the older model m77 mkII?
as long as it is a Mark II and not a tang safety model you should be fine.
and i agree with NHLever that the trigger on the new hawkeye should be
a much more desireable trigger over the factory mark II." Ruger Hawkeye/M77 Mark 2 Differences - Shooters Forum
That is all I have found that I thought might be relavent to your question. I personally do not have, nor have seen or shot, either of these rifles. A search on google can bring up many results and you can choose what really answers your question