I think 20-25 lbs and 2 inches is a pretty significant difference at that position and at that size. I've seen them both play in person, so it is what it is.
I'm not sure what you mean about helmet sizes. They don't measure players with a helmet on. Godfrey just graduated in 2013/2014.
you're trying way too hard. there are margins for error. they're very similar sized guys