The things I have noticed so far include:
Unit upkeep is reduced.
Recruitment costs are lower at lower difficulty ratings.
Building costs are lower at lower difficulty ratings.
Research is slower at higher difficulty settings.
Trade is changed at various difficulty setting.
Skirmisher units have 90m range, and many have a gaggle formation rather than ranks.
You have to fight to keep trade spots. Navies are more important and some ship stats are changed, if not on the cards.
There is more but some of you may have noticed other things I have missed.
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