Considering that IG was just a cheap copy of Total war I would not say so.
One review I read refered to IG as Total war's retarded half-brother I remember.
But even if IG wouldn't have copied TW, CA would still go for this period.
The period is perfect for a game like Total war so we would have seen it anyway especially since people started asking about naval battles and this period offers the best when it comes to that.
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