just because i have nothing better to do, here are more swatches/comparisons between mac & nars blushes (always, mac on the left, nars on the right)
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conclusion: similar, but noticeable differences. orgasm is a lot more glittery, it's also darker and more pink. dainty is lighter and more peachy
conclusion: again, similar but noticeable differences. desire is matte, a darker and brighter blue-pink (almost purple compare to pleasantry), pleasantry is lighter, more neutral and more sparkly (color looks a bit washed out in the picture)
conclusion: umm, not so similar. merrily looks like a brick red with gold shimmer/sparkles, where as Mounia is a berry red with wine colored shimmers
then, some random swatches
and then, some more (all in the same order)
with flash
with flash