Perhaps this might help?
http://www.langleyflyingschool.com/P...2008%20(2).pdf
Training
http://www.redskyventures.org/doc/ot...Seneca_POH.pdf
As far as I can remember, the Seneca II was the PA34-200T with Continental 200HP engines.
The III was kitted with Continental 220HP engines and was the PA34-220T. (As were the Seneca IV and V.
The dreadful Seneca I had the Lycoming engines and was the PA34-200.