For an N frame with non matching stocks I would say you did OK but you did not steal it.
Purist collectors want all matching numbers but non matching stocks in S&W's seems to be more of the norm as opposed to the exception. Not sure why that is other than to many it is merely a tool and working stocks are more important than those with matching numbers.
This is even more prevalent in guns that have been through a military or law enforcement armorer. Again, these folks are more interested in function than originality.