Does the amount of Botox injected vary from person to person, even for the same area?

When you first look into Botox
I thought that for the same body part, most people used a similar amount.

However, I heard that the required amount may vary depending on muscle size or movement.

Come to think of it, everyone has different habits when it comes to making facial expressions.
Even if it is the same forehead or glabella, the degree to which the muscles are used seems to differ.

So, when you have your first consultation, rather than simply talking about the area...
I am also wondering if it would be helpful to explain whether I tend to use facial expressions a lot in my daily life.

If I am getting Botox for the first time, I would like to know if it is good to mention these things during the consultation.