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Possibly because it is an entirely different timber.
The tree known as Sycamore in the UK is Acer pseudoplatanus
Platanus occidentalis is known as Sycamore in the USA.
Probably different climates , but as Neil said there is an American Sycamore and UK Sycamore.
I bought this block as Spalted Sycamore in the US
Read about it here http://homeguides.sfgate.com/sycamore-trees-40884.html