The Helmsman 31 is an update to the Camano Troll that was manufactured from about 1989 to about 2006. It's a different manufacturer using the same design and molds. The original was made in Canada, the Helmsman 31 is made in China. The engine is different and much of the interior has been changed but the hull and general design is the same.
My boat is a year 2000 Camano Troll and I love it. My wife, dog and I recently returned from a 69 day cruise on the US east coast and across FL and back.
There were about 260 Camanos built so if you think you see a Helmsman 31, you most likely saw a Camano.
Congratulations on your new boat, you will love it.