I have found one difference from the State Archives, although it's not immediately obvious: WA deaths on the State Archives website go up to 1965, but Ancestry has some more recent ones (I found an auntie who died in 1974). No date is given in the date of death column, but you can work out the year, because the reference number (which you can see by clicking on "View Record") will be something like xx/74 for 1974.
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