When I was a teenager I once got into my parent's Mini, started it up and pulled it out when I realised "we don't have a radio" .... pulled it back in, got into

When I was a teenager I once got into my parent's Mini, started it up and pulled it out when I realised "we don't have a radio" .... pulled it back in, got into the other yellow Mini parked behind it and went home. What are the odds two identical yellow minis in the same town had the same key?