its strange that voxel don't give links to just these mods on their own , but thanks anywayYes, it should be. You can download the Ultimate pack, and then copy the voxel mods over from the Ultimate packs mod folder into the DireWolf20's mod folder. Do the same for the voxel configs.
Also, as Whovian (savior of the universe) has mentioned below, you need LiteLoader.