In the C-101EB there is a TACAN receiver and a VOR receiver, but there is no DME receiver.
A typical VORTAC station on ground consists of a VOR station and a TACAN station together in the same sitting. So it has a VOR part (that generates radials electronically by means of spatial modulation) and a TACAN part that a civil DME receiver is able to read, since TACAN DME part is compatible with a civil DME receiver. So, a DME in a civil aircraft will be able to read the DME part of a TACAN while a VOR receiver won't be able to read the directional part of a TACAN, which uses a different method than VOR to generate radials.
Therefore, when you tune in 110X in the C-101EB you get both direction (radial) and distance since it reads the TACAN part of the VORTAC.
When you tune in 116.3 MHz with the VOR equipment you get the VOR part of the VORTAC and therefore you get directional indication, but you don't get distance since there is no DME receiver in the C-101. Unless you have 110X tuned in, of course.
In the C-101CC there is a VOR receiver and a DME receiver, though no TACAN receiver.
When you tune 116.3 MHz in the C-101CC you get both directional indication (from the VOR part of the VORTAC) and DME indication (from the TACAN part of the VORTAC), since, as said above, a DME receiver is compatible with a TACAN DME part and able to get distance reading out of it.
Hope it's all clear now :)