v-4/vt-22 sensitivity question

[meexiko]

Hi everybody,
I've just seen in the 1971 Ampeg catalogue (the one that's in the docs section of the site) something that I don't understand very well.
The last page of the catalogue is about V-4 specifications. It's written that the sensitivity switches have 3 positions:

pos. 1: Normal sensitivity with high overload
pos. 2: Medium sensitivity with moderate overload
pos. 3: High sensitivity with easy front end overload

On my Master Volume VT-22 next to these rocker switches it's written -9db/-6db/0db.
So, is it the same thing or is there something different in mine/MV models?

Thanks!