Wow man. Don't bump 9 minutes after you post. Bump maybe 2 days later, some of us have jobs and don't live on here.
Short answer no and you need both. The IR cut filters on sensors are usually weaker than the near IR filters on lenses. So you can get acceptable IR shots on an unmodified camera.
But the issue here is there are still two filters fighting against each other. The above shot was about 15 seconds f/4.5 ISO200. A modified camera would probably be close to handheld territory with shutter speed. I know the D200 I used on the above image suffers a whole 10stops compared to a modified D200. That would be 1/60th for an unmodified camera and a far stronger IR effect.
They don't work anywhere near as well, but the filters aren't useless.