Yes they are. If you have front sensors, you have front wheel ABS. The 5.7L Hemi does not use a separate front sensor for speed control. It gets all it's info from the PCM, which is the same info that is used for the speedo.
The only way to know for sure which sensor P/N you need, is to supply your VIN to the supplier. 2006 was a bit of change-over year.