In years past, I've had both,.... the Hatfields, and the Pedersoli Blue Ridges.
Some parts will interchange on the 2 rifles,...
The Hatfield used Pedersoli locks after a certain serial #, which were better (IMHO) than the original Hatfield locks.
The Hatfield barrels were about 1/2" longer than the Pedersoli Blue Ridge's.
And the Hatfields used Curly Maple wood,... verses,... Pedersoli Blue Ridge which uses European walnut.
The butt-plates won't interchange between the two types of rifles,... and neither will the triggerguards.
Those are the major differences between the 2 rifles that I can recall (just off the top of my head).
IMO, the Hatfield should be worth a little more money then a Blue Ridge, mainly because of the quality of it's wood.
HTH