Not the same thing. What tandem jumpers use is called a Stabilizer Drogue. Not really designed to slow your fall to any great extent. More to provide a stable and controllable fall. Two jumpers attached together is a very un-aerodynamic package so the drogue keeps you from spinning or tumbling prior to opening the main parachute.
As I believe was posted above, a pilot chute is a small spring loaded parachute that pops from the pack and into the wind stream to help pull the main parachute canopy from the pack.
Sometimes, the drogue does serve as a pilot parachute too, depending on the