195/499 = 39%, just about dead on for a cyl bore. (many cyl bores will not come up to 40%)
343/499 = 68.7%, which I would call a full choke pattern.
Question might better be to ask "How" did the author determine it was Cyl/Mod. The stamped patterns would tend to Cyl/Full. (many bbls marked Mod will pattern higher than 60%)
I see no real discrepancy here, just individual bbl patterning characteristics. If you use the 511 count then % drops to 38%/67% respectfully.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra