It will be tough to find and exact match. - Take a sample to a good brick suppliers and they usually have access to sample boards to find something very close. If you are lucky they may find and exact match that could be available.
Even getting a special run (if possible) would be very, very costly and still may not be exact because the clay deposits change slowly over time as they are mined in different areas.
A run of brick represents many days of production because most plants extrude and fire brick continuously on a 24 hour schedule.