Abe as you know we preach over and over follow the kit instructions. If the kit came with both, use both. Once again which kit is it you got?
5 of the reds already come with a pack of raisins, so if you purchase the grape pack, DO NOT USE BOTH. Use either the grape pack or the raisins. If you use both, you will wind up with too much sugar which may kill the fermenatation resulting in a sweet wine.