As you plan, it is best to keep the outside kitchen reasonably close to an entrance to the inside kitchen. This will simplify preparing meals for large gatherings, which often require many trips between the two kitchens during cooking and cleanup.
Because outdoor kitchens have become so popular, the choices in appliances for outside use has been expanding in recent years. Assume that you will want a full line of appliances installed once you build. Align your utility services accordingly.