Why? Buying 14 new Chinooks that likely wont see service in Afghanistan doesn't find the money required nor make the Merlin suitable for the upgrades the Navy says it needs to go to sea.
I don't wont to get into the argument as to whether the Green Merlins should or should not go to the Navy (there is a sufficiently long thread for that already) just pointing out the two are not inextricably linked.