NO, not ever
Candle dye has a completely different makeup than soap dye one dye cannot ever be substituted for another!
The fragrances are a 50 50 shot, some are safe for both candles and soap, others are not. Your supplier can tell you for sure or the bottle will state "skin safe". If you are not sure, do not use the fragrance for soap. Not only do you not want to harm yourself or others with something that is not proven to be skin safe, I found out by accident you can cause a strange chemical reaction by adding candle fragrances to melt and pour soap.45AD6c