The document below is a piece of history describing friction that exists even up to this day between the multiple groups and one tribe residing at Pala. It's not just Old Pala Luiseno (Band) and Warner Ranch (Agua Caliente) Cupeno (Tribe). There are also Cahuilla (Band), Yaqui (Band), and Iipai (Band) living at Pala as well.
If you are confused about the difference between a Band and Tribe you are not alone. The BIA can't keep it straight either.
An example would be to consider Luiseno. Luiseno itself is a tribe. But there are many Bands of this tribe living all over Southern California on multiple reservations. The Pala Luiseno are a Band of the Greater Luiseno Nation.
The Cupeno are a tribe historically residing at Agua Caliente aka Warner's Hot Springs (Ranch).
The Cupeno as a tribe were forced onto land purchased adjacent to Old Pala's land.