bike registration number

How often do you see the registration number of a vehicle quite similar to yours? There is a bike (Yamaha RX-100 or 135) in my area which only has one letter different from my bike’s number. The number of that bike is KA-03 EA 4810. The first time I read it inattentively, I thought the numbers are same and I was taken aback for a moment only to realize later on that one digit was different.