There's no ingredient listing so I can't determine if they're truly safe for rabbits. You really shouldn't need either product if you're grooming them regularly.
http://www.aspca.org/Pet-care/ask-the-expert/ask-the-expert-poison-control/non-toxic-antifreeze.aspxBoth propylene glycol and methyl alcohol have the potential to cause gastrointestinal irritation, central nervous system depression, and even death from respiratory failure in severe cases.