As said earlier (I guess you didn't read the thread), this is due to your engine being a 1.6L and therefore producing less torque at the low-end, so when your auto VTEC kicks in bro there's a bigger 'jump' in torque. Because the B18C makes more torque the 'jump' is less noticeable and so the VTEC crossover is smoother.
This is why B16A's also have a loud crossover.
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