It's a clone, it all depends on how "original" you want it to be. Are you a purist, or do you want a rifle "just like it"?
The R700 hasn't changed much in 62 years, is there going to be a big difference operationally if you sourced an action made in 2005 versus one made in 2015 blued steel or otherwise?
The answer is no. The purists will tell you it isn't a "real" XM3, but guess what, it isn't a real XM3, they made what, 52 of them? It's a fucking clone.
You could source a proper remington bolt for that action, there are plenty available.