I have made 12 quilts for family members using a combination of my Mother's stash and my stash. My Mom pre-washed her fabrics and I don't. After quilting, I washed them with a color-catcher sheet. No problems with any of them. So, you should be okay.
This year's Block of the Month quilt from our local quilt store is all batiks with some dark colors (and light colors). Since some of those pieces are small and they don't give a lot of extra fabric, I don't prewash those either.
I have been lucky with other quilts (Batiks) without pre-washing, but I always use color-catchers. Hopefully I won't get "burned" on this year's quilt.....I made one in each color-way.....so that would be 2 quilts "messed" up.!