Unlikely. Both are measuring in miles/tenths-of-miles, and a difference of 18% would be more than data set resolution would provide.
Did you *read* that linked article about the coastline of Britain?
It's not about whether or not they give you the answer in tenths of miles or not. It's about how much detail they measure in the crinkly bits.
Although I agree that 18 percent seems kind of high on the face of it, if the Garmin device is trying to save ROM/RAM space by not mapping the crinkly bits very tightly, you could get quite significant differences.
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