The difference between them is, if it dies or is stolen or lost, one has Acharayus for a Neder, not for a Nedavah.
Haddiise ay afbannaan tahay, ama waxaan u qalmin laga dhisay iyana la dhaafshay, ama la isku dhisay waxna la is dhaaf-dhaafshay hadde waa laba khasaar, illeyn col hantida lagama soo dhicin ee kii wax ku lahaa baa sii gabbaadsan jiraye.