You need to look at them very carefully, the shiny one is definitely a different fan housing. The serial numbers are different, but I'm sure there will be a logical reason why this is so, such as the owner changed the fan housing cover for a different one, but those etched serial numbers are unique to each and every Kirby - on later models they showed the date of manufacture, 1811000354 means it was made at plant 1 in the 10 th month of 81, and the 00354 means it was the 354th one off the line.