The day flight via TPE is usually scheduled with a newer 330, but is sometimes operated by the older 333 with recliners. On the plus side, the cabin is usually empty on TPE-ICN and the crew can be particularly friendly towards the lone C passenger flying BKK-TPE-ICN with them
Otherwise, the worst seat would be a middle, angled seat on the 2-3-2 773.
The 77W continuing on to LAX has staggered flat seats and should not get swapped barring major issues.