The Eendracht and the Groot Hollandia are not quite the same dimensions

I guess that I had known that the Groot Hollandia (built somewhere in the 1654 to 1655 period) and the Eendracht (built during 1653 or 1654 and beyond) were not quite the same dimensions, despite them being nominally the same (150ft x 38ft x 15ft in Amsterdam feet). The Eendracht was 137-1/2ft x 34-1/4ft x 13-1/2ft (in Maas feet of 12 inches), while the Groot Hollandia was 135ft x 34ft x 13-1/2ft (in Maas feet). A quick way to convert Maas feet to Amsterdam feet is to multiply the dimensions in Maas feet by 12/11, and the answer will be pretty close. Sources:

1. Ron van Maanen, unpublished manuscript "Oorlogsschepen" van de admiraliteit van de Maze in de zeventiende en achttiende eeuw, undated