Is the plywood darker or lighter than what you have? Cherry will darken with exposure to sunlight and air. If the cherry plywood has been kicking around for a while it might be darker, or if it has been stored under other sheets it will be lighter. Similarly, freshly machined wood will be lighter, but will darken with age. Stick the lighter piece in the sun for a few hours. Do it in increments until it darkens enough. Youíll be surprised how effective this is. You might have more luck with this than staining, and might avoid differential darkening later - the idea is to get the pieces similar before you stain if is possible. Obviously, if the difference is great, the sun trick may not be effective. For non-believers of how effective this can be, take a scrap piece of cherry and place some opaque tape on a small section, then put it in the sun. Remove the tape and you will see the difference after even a few hours.