Many thanks for pointing out my error. I have edited the text and would be grateful if a moderator could edit the thread title.
Thank you also for confirming that I should be able to check my bags all the way through to BKK and the position in relation to the exit rows and Skyteam which may well affect my decision.
If anyone can provide me with an idea of the difference in seat comfort and service in J class between KLM and China Airlines I would greatly appreciate it.