I agree with pre-washing!
Having said that...I've never had a red Kona bleed. I'll see some pink come off on a color catcher but never seen it lay any dye on other fabrics. I made a red, black and white quilt with Kona - it's been washed at least 3 times that I know of and the whites are still crisp and bright.
No idea about Moda, though.