The TC-14A was designed for manual focus lenses and does not support autofocus, although it will mount on most autofocus lenses and allow you to use the resultant optic in manual focus mode.
The TC-14E is meant only for AF-I and AF-S lenses and will only mount on the long AF-I/AF-S lenses, and is prevented by a mechanical tab from coupling with standard AF or MF lenses.