Larger throttle body

Couple questions about using a larger throttle body.
1st when using a larger tb on an otherwise stock engine would there be any places in the ve table (idle or open) that would be lower than stock at any rpm or map kpa.
2nd I am using a tb that has an iac valve where the oe tb used a stepper motor against the throttle arm with no iac.what difference would that make if any.
Thanks for looking.any input is appreciated.

Only thing that ive read, more air needs more fuel which ive multiplied % bigger tb to AE tps and map. Ive also applied this when going to a smaller to bigger injector but making AE % smaller. Idk as long as it responds the same I don't see it anywhere different than drive by wire throttle bodies that don't have an iac and iac functions are controlled by throttle movement.