I've often observed many MA students confuse these two types of shrines. Here is what I've put in my notes, including added information gleaned sometime ago, perhaps from this forum.
"Kami dama:
The Shinto family altar where the family ancestors are venerated, as opposed to the Butsudan or Butsudana, which is the Buddhist family altar. The following information should be remembered for those that wish to set up a Kamidana in their home.
The shrine should be facing either Eastwards or Southwards.
Do not touch the mirror.
Wash hands and rinse mouth before touching any sacred item.
Do not breath upon the sacred item.
Do not blow out candles or incense.
The water in the tree branch vases and the water in the coned cup should be changed everyday.
Tree branches, salt and rice should be changed on the 1st and 15th of each month.
The doors on the front of the shrine are allways kept closed, unless a priest conducts a special ritual.
Prayers are normally opened standing, then executing two deep bows, two claps and one last bow.
When prayers are finished repeat the same.
Kamiza:
The High Seat, the area of the Dojo where the Spirits [Mitana] of the Deities [Kami] are enshrined. Everyone entering or leaving the Dojo or mat area is required to bow to the Kamiza. The Kamiza is normally placed on a north or east wall, and should never be located above a doorway or window, nor adorned with any weapons whatsoever!
I've been in a number of Dojo's where the Kamiza is festooned with weapons, located over a doorway, and positioned on the "wrong" wall.
Guess these schools were more worried about aesthetics, but still it reveals a great deal about the school, its founder and instructor!