Looking on airliners.net, the 346 appears to have the same seats as the 744 going by the pictures..
...and the
777-200 http://www.airliners.net/photo/Thai-...2D7/1397285/M/
But none as comfy as the
777-200ER http://2.bp.blogspot.com/_MlcIJtVqC0...dsc4457jz5.jpg
http://www.hflight.net/blahdocs/uplo...80_65_2365.jpg