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More is happening in EU4, also those are minimum requirements, not recommended.
 
But a much smaller map, fewer nations, fewer armies (EU4 armies are permanent, most CK2 ones are temporary).
 
Yeah EU4 runs better for me and sometimes after playing CK2 for too long there are some graphical glitches and sometimes I've even had crashes, my computer is much better in the GPU department than in the CPU one so there's that.