How does full-depth reclamation (FDR) differ from a mill-and-overlay?

1. FDR only paints the old surface; mill-and-overlay rebuilds the entire embankment
2. FDR pulverizes the existing asphalt and a portion of the base, then stabilizes and compacts that material as a new base; mill-and-overlay removes a surface thickness and replaces it with new HMA
3. FDR is only used on Portland cement concrete pavements
4. There is no difference; the terms are interchangeable in MDOT work