ABYC is the boating standards organization, and in approx. the year 2000 they amended the overall length to include molded in extensions to the hull such as bow pulpits and pod type extensions (Eurotransom). Based on this standard change, if two boats whose centerline length excluding the bow pulpit was 24', and both had bow pulpits of say 2.5' with Boat A's bow pulpit bolted on, and Boat B's pulpit molded in the fiberglass, then Boat A would be considered a 24' boat and Boat B would be considered a 26.5' boat even though they are essentially the same boat. The same math can be applied to a bolted on pod vs a eurotransom. Accordingly in the early 2000's most of the fiberglass boat manufacturers took advantage of this only offered molded in bow pulpits and revised their models to reflect it and oftentimes made slight changes to a model and called it something 2+' longer.
Generally when you pay for moorage, they look at overall length from bow pulpit to back of outboard.
DAJ