Would a 20" wheel vs a 26" wheel make much difference for torque?

Update: my ebike currently freewheels at 65mph would a 20" freewheel at 50mph with 24% more torque?
Update 2: Would the 3000w battery become equivalent to 3700w only reducing the freewheeling speed but increasing the riding speed and the torque?
Update 3: the riding speed is currently 45mph
Update 4: Is the top speed only reduced based on the top freewheel speed? (when it's only throttle)
Update 5: *freewheeling
Update 6: Basically my question is is a 20" wheel best suited to a 3t hub motor when the battery power will only carry me at 45mph.
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