The KP44 was, originally, better constructed. It also has a cast-iron keel
encapsulated in the hull
while the F46 has iron chunks embedded in concrete surrounded by fiberglass
. I know of no F46 or KP44 that has had a problem with the keel
There are two easy ways to tell the difference.
The KP44 has a teak veneer fitout while the F46 has solid wood.
The KP44 has a vertical row of carriage bolts to secure the aft chainplate; the F46 has
a round stainless terminator plate.
The KP44 has chainplates that pass through the deck
and are bolted from the inside; the F46 has chainplates that pass through the cap rail and are embedded in the hull
The KP44 is 44' overall; the F46 is actually 45' long.
If a broker is trying to pass off a F46 as a KP46; they are totally different boats, much newer and of a different design below decks. Look at www.kp44.org
layouts. The KP46 has a large round dinette on the starboard side. Dinettes on the KP44 and F46 are to port.