you're best bet to match (as I'm sure you know) is to use Brazilian Cherry. Nothing else will match, even with a stain. The color and graining will be different. Furthermore, it will cost you more in the future when you need to resand/restain. Near alternatives, such as santos mahogany, would be similar or more expensive so you might as well match.
Alternative, and I don't know how much this costs, you could get what's very stylish now - a wrought iron banister w/ brazilian cherry insets. That way, you match and it looks great. I don't know about the cost.
Debbie Gartner aka The Flooring Girl
http://TheFlooringGirl.comWestchester County