333 = A330-300 old config. Seatmap:
http://www.thaiair.com/thai-services...nloads/333.pdf
330 = A330-300 new config. Seatmap:
http://www.thaiair.com/thai-services...nloads/330.pdf
New config has better business class seats and AVOD in all classes. The old config has non-AVOD in business only.