^^ I'll add that college footballs used to be a bit thinner (IIRC), I remember the old Nike 3005 footballs actually had a "small girth" model that definitely felt smaller.
According to google this is still the case: "college footballs can be up to 1-1/4 inches smaller than NFL footballs. To get more detailed, the circumference of a college football ranges from 20-3/4 inches to 21-1/4 inches lengthwise from end to end, vs. the 21 inches to 21-1/4 inches in the NFL."
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