It might be worth looking for a business that sells recycled tiles in your area so you have a stock of spares. You will always get a few cracked tiles now and then. The tiles used at our set of townhouses are no longer available but they were common a few decades ago. A local business (in Queanbeyan, near Canberra) buys whole roofs of tiles and stockpiles them. These might come from demolished houses or they might come from extended houses where a set of uniform new tiles are put on both the new bit and the original bits of roof.
Anyway, we bought used, matching tiles when we extended our unit and the OC used the same used tiles when adding to our carports (over previously uncovered parking on common property). It looked much better than an instance of an owner who extended their unit with new tiles and it took many years for them to weather enough to blend in.