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The Zumwalt designs didn’t go forward because of problems with replacing the barrels.As I recall, the gun wasn't entirely reliable, as you say the barrels had to be replaced often, and it utilized a very specialized (expensive!) ammo.
If the rail gun is as advertised, and compact enough to fit on a ship, that potentially a field-able weapon.
The main differences are going to be in electronics.More than that. Armaments. A quick check says this cutter has no VLS cells. The FREMM has VLS cells. The cutter is mostly armed with small cannons, which you would expect for domestic coastal duties (e.g. dealing with narco boats, search and rescue, and such). However, this says it is upgradable to larger 57mm, and some other hardware.
en.wikipedia.org - Legend class cutterIt also appears to be good at stealth.
