I have worked with material that needs to meet a "minimum" CVN requirement. It is usually 20 ft lbs at a certain degree, the least critical is 70 degrees, and more stringent temp would be 0 degrees or -20 degrees F.
So as long as your material or filler metal for that matter meets the minimum requirement, whatever it is, it is ok if it exceeds it.
So if it needs to meet 20 ft lbs at 0 degrees, but the certs/ test report says the actual value is 66 ft lbs, then you are fine. If it said 18 ft lbs, then you'd have a problem becasue it doesn't meet the minimum requirment.
There is further info on this topic in AISC 360-05 "Specification for Strucutral Steel Buildings" its a free document from AISC in Chicago.
Good Luck