Ya Khiem
That is the case most of the time. Rabbit and 88 are correct. In some cases like Longisland hunters CFX, he shoots mainly RWS Superdomes like I do, and he states that both pellets react the same so he does not have to resight but that won't be possible with each and every rifle, even though they are the same.
My experience with the Superdomes in my CFX .177 are the same as Longislandhunters. Nothing changes when I shoot between the Preditors and the RWS Superdomes, but my CFX .22 does change, so I have to reset scope for the Preditors when I shoot them.
It is all experimental with pellets and springers... hehe Nothin is ever the same...
Gene