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Joe: You may have misunderstood my comment. When I stated '...But, if I
made
a game and called it Grand Shatranj 2, or Chess with Different Armies 2,
then those names are indeed problematic.'  I meant that 'me' not being
the inventor, should not use those names.  You [Joe] having created Grand
Shatranj, have every right to have a Grand Shatranj 2, 3, 4 , etc. 
Whereas I should not make any game called Grand Shatranj ____.  Case in
Point is Pillars of Medusa.  I first called it Medusa Chess... not knowing
there was already a Medusa Chess.  'Medusa Chess 2' would be
inappropriate, for reasons indicated in other comments here.  Thus, a
third name was chosen.