While you can purchase items made for other small animals for your chinchilla, like guinea pig supplies, make sure that the food you get is made for the specific dietary requirements of chinchillas. And your other chinchilla accessories should work well for their habits and preferences as well.
In terms of chinchilla food supplies, a veterinarian can give you a list of items not to feed your chinchilla. As some foods are poisonous to chinchillas, double-check that what you give them does not include toxic foods. Some examples include peanuts, bananas, lettuce, cabbage, corn and more. They can tolerate some limited fruits and vegetables, but high-quality chinchilla pellets or mixes are best.
Because of their propensity for chewing and other similarities, chinchilla and rabbit supplies are often interchangeable, but make sure to read labels and descriptions carefully. The chinchilla pet supplies you find should be made with nontoxic materials designed to withstand chewing. Avoid any toys with small removable pieces that could become choking hazards.