Carryover doesn't mean it wasn't changed in any way, it means it was essentially the same. I also described the interior as largely carryover, which doesn't mean that there was not one change.
It's the same engine. Everything I'm seeing, including in this thread, supports the idea that it's the same engine. If I had been writing a review of a 3.0-liter model I would have more thoroughly discussed the spec upgrades, but in the same way I've referred to Toyota's 3.5-liter V6 being shared across many models (though they definitely have some differences between them), the Fusion 3.0 is carried over from 2009.