Orchestration

I am cast as Muzzy in Thoroughly Modern Millie. The musical director has the orchestrations for "Only in New York" and "Long as I'm here with you" but the key doesn't match the key of the original Broadway recording. sung by Sheryl Lee Ralph. Why is this? What key did Sheryl Lee Ralph sing these songs in? Also do you have the performance tracks for these songs in Sheryl's key? What would it cost to have the orchestrations transposed for both of these songs?