I am not sure what you are asking, but the 5e24 assassin (CR 8) would be CR 10.5 by the 2014 CR guide. On the other hand, the 5e14 assassin is a CR 6.5 per the 2014 CR guide. So the assassin jumped from an effective CR 6.5 to 10.5 in 5e24.
It really depends on the group. For most of the people...