I should have said pact blade boomerang. It's a light blade so it qualifies.
And yes, both add renau1g. It works like this:
The hybrid quarry and curse only add to powers from that class.
Hurl and stab (ranger at will) lets you throw a weapon and charge.
Eldritch stike (warlock at will) can be used as a basic attack so you can use it in the charge you get from hurl and stab.
Since you have used both a ranger and a warlock power in the same attack, both can be added.
Really? My warlock with eldritch strike would be happy to use one and she has no charging powers for class (or any other melee powers for that matter).