No, not the same thing.Are the wood pellets for stoves the same thing, Debbie?
My understanding is you can use the wood pellets for stoves for the chickens, but cannot use horse bedding pellets for pellet stoves. My guess would be the pine bedding would burn faster than the stove pellets but there maybe are more issues I'm not aware of.
Also, you'd most likely have to use the plain ones, not ones that are smoked or infused with flavors.
If we got rid of our pellet grill and had a bag of plain ones left over, I'd dump those in the coop but wouldn't buy them for it as they're more expensive.