If I understand the process for moving stamps to a new passport correctly (Non-O Over 50 Extension) at CW:
Enter Thailand with both passports, new passport gets stamped in.
At CW
* Need transfer stamp form and both passports
* Updated bank book and copy (bank book only. Not the full year report that takes a week from Bangkok Bank?)
* Copy of photo pages from each passport
* Copy of last arrival stamp (from the new passport) and last extension (from the old passport)
They move the stamp to the new passport.
And then, since I got my multiple re-entry permit at Suvarnabhumi, I need to take both passports there to move the re-entry permit, which I can do on my next flight out.
Am I missing anything?