When getting filler again in the same area, is less injected than the first time?

This is something I became curious about while looking up the duration of fillers.

I wasn't sure if they use the exact same amount as the first time when doing touch-ups after some time has passed since the initial procedure, or if it varies depending on the amount remaining.

Especially if you want to maintain a natural look, there might be ways to make small adjustments.
For those who have undergone revision treatment, was the process different from the first time?