So you have 1 laser controller, FB3 or FB4?
And you want to control 2 lasers with it with different output?
Basically thats not possible.
The only way to do this is to have 2 controllers.
There is a method to daisy chain the ilda cable.
If you do that and the second laser has something as an X invert it will do the opposite.. But controlling multiple lasers with different output from 1 controller is not possible.
If the second laser has no option to size it, the only thing I can think of is touch your scanner settings inside the laser, but with the question you ask I would highly recommend NOT to do that.
Scanner tuning is an art on its own.