The key differences between the Royal Game of Ur and the Shahr-i Sokhta version are the many different pieces, and the lack of “rosettes” denoting certain board spaces as special. Source: https://osf.io/preprints/socarxiv/kctnj / CC-By Attribution-NonCommercial-NoDerivatives 4.0 International

Shahr-i Sokhta: How to Play the Oldest Board Game in the World, Iranian Edition

In 1922 the British archaeologist Sir Leonard Woolley discovered something unexpected during his excavation of the Royal Cemetery of Ur, in Mesopotamia. Amidst the grave goods and treasures he uncovered a rectangular piece of wood, heavily ornamented and with indentations along the sides. Woolley had found an ancient game, complete with pyramidal dice and pieces.