Hi Northmn,
Yes, you can stain black walnut to look like English or European walnut. However, if you have the chance and can afford to buy English walnut, I urge you to do so. It usually is much nicer to work with than black walnut. For staining, the key thing is to eliminate the cold, purplish undertone of black walnut and replace it with a warm, yellow or orangy undertone. I do that by giving it a liberal wash in yellow aniline dye. Then I either just finish it or stain it more to achieve a specific English walnut effect. It is a trick recommended years ago by Kit Ravenshear.
dave