Dave,
Last time I looked into it I found that the 2 HP Honda 4 Stroke weighed 27 lbs dry (unless they lied) and the 2 HP Evinrude weighed 25 lbs. Did you find info suggesting a 10 lbs difference? Also, the new Hondas are air cooled so that may reduce the "wet weight" relative to the Evinrude. The Hondas also offer a centrifugal clutch which is a really nice feature which I don't think is offered on most other 2 HP outboards.
Jerry