The 300 is longer by around 20 feet.

All the 767-200's I have been on are 2-2-2 in business class - and don't recline much

The 767-300s are a mixed lot, There are at least:

XM version 1-1-1 with lie-flat seats at an angle and On-Demand Video

International version with 1-2-2
International Version with 2-2-1

Lots of leg room and recline, not close to lie flat though. Only regular video, though on international flights they had out personal DVD players.

Domestic version with 2-2-2

In the back of the bus - economy - they are all 2-3-2 with the Ex-Canadian ones with blue upholstery having my vote for the roomiest, most comfortable seat.

There are at least 4 different seat variations in economy and which one you get is pretty much luck - until thay are all XM'ed and have the mediocre new seats.

Seat 14k