How to copy drivers on Shape Keys from one object to another?

I have two figures, one low poly and the other HD with the same height shape keys.
But one has drivers, the other does not.
I want to copy drivers from one model to another.
I tried using link object data and link animation data but nothing helped.
Any ideas on how to do this?
I found this example, but my figure has the same armature
Copying each driver separately takes too long

Why not copy the entire armature (the one with the drivers) to the other figure?

then update the Armature modifier to contain the new rig.

edits: clarifying.