Yes, they are. Please also see the Sticky in the Compost Forum about "greens" and "browns" for compost piles, and take a look at the list of previous topics in the Compost Forum.
It's quite an education, with many links in the messages as well.
.. I've heard rabbit droppings are good to go directly in the garden. It's the bedding and litter that might be a problem.
Droppings are nitrogen and typical bedding is brown. You're already getting that carbon nitrogen mix. Rabbit urea is more nitrogen. Throw it in the bin. We use shredded paper for the litter and it all goes in the bin.