Is the clutch pedal return spring and the over center spring the same thing?

The big spring in the car only pulls the pedal up the last ?? inch?? or less. This is why it's called "over center." If it always pushed "down" the linkage/ TO bearing would always be under pressure

As you start "from the top" and push the pedal down, it takes practice to "notice" when the spring goes over center, but you can feel it. After that point, to the floor the spring "helps" you push the pedal. Sometime, if you have the linkage unhooked, this action is obvious.

The "clutch return spring" is quite weak, and as above underneath. It's job is to help tension the linkage towards the "disengaged" end of travel, and to help keep the t/o bearing away from the clutch