BK swivel knife blades question

[NigelQB]

Wasn't sure where to post this, so figured it would go here. I recently bought a bk swivel knife with a 3/8 thin blade. The blade is about 2x the size of my bk 1/4 thin blade. I'm assuming it's right, and the extra thickness is to account for the extra length for the hollow grounding. If thats right, how thick is the thick blade realtive to the thin blade?

[buzzardbait]

my BK thick blade is 1/8 and my thin blade is 1/16