People say they are. My experience isn't accurate because my "teardrop" headlight is hazy. I swapped one onto my passenger side of my 2004 after hitting a deer, and my aftermarket old style headlight with aftermarket bulb is clear and brighter. So, not a good comparison.
You need to swap the headlight bulb plug (marker bulb plug is the same) to install the headlight. The headlights share the same mounting points. May want to swap to the T&C bumper cover with the cutouts for the teardrop headlights, but don't necessarily have to. I saw one van where they didn't.