No — raisins are just as dangerous as grapes.
Raisins are dried grapes and carry the same kidney-failure risk — ounce for ounce they're actually more concentrated. No safe amount is known. Treat any raisin ingestion as an emergency and call your vet right away.
If your dog already ate this, don't wait for symptoms — call your vet now, or the ASPCA Poison Control line at (888) 426-4435. Note what and how much was eaten.
Get the printable list of the 30 most dangerous foods for dogs.