Not only: some weighed the borders of Europe (i.e. the result was 'equidistant' from the extremities), there can be differences in how much shallow water is included, and Northern Russia wasn't all that well known when the earliest were determined.

Tho' the Wiki says that the Soviets' re-determination got the same result as the last Austro-Hungarian one, that village in the Western Ukraine.

_{*Lunatic*, n.
One whose delusions are out of fashion.}