Aside from the differences in stove, any evidence the CC makes a noticable difference in fuel usage in the field?

My brother bought an AGG caldera cone with matching stove. I use the penny stove. (both of us have the AGG pot) we've been on trips together and while his caldera is nice, from a practical in the field purpose it doesn't seem like he uses any less fuel. (me using the penny
stove with a foil windscreen, and he using the caldera stove and cone, both of us with
the same pots)