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Well, it would appear in my case that the "time and help" you refer to was actually more of a hindrance. I should have been more emphatic that the infomation provided in the linked post was at-best speculative.
If it were my vehicle, I would replace all 3 rear coils this time. Particularly so since you have found replacements at an atractive price and it sounds like you don't really want to pull the intake plenum a 3rd time any time soon. The number of recent similar spark coil complaints for '05 and '06 model years on various Avalon forums suggests a relatively short component service life.
As to the busines of one aftermarket part number replacing more than 1 factory P/N, I can only venture a guess. Perhaps the failure rate began to cost Toyota lots of $$ in extended warranty claims, thereby convincing them to redesign the part for improved robustness. It is probably a $200-$300 job at a Dealer to replace one rear bank coil. Keep in mind that less than 1% of Avalon owners participate in online forums, so the real failure rate could be much larger than we realize. The redisigned part would have identical physical dimensions and functionality, so an aftermarket coil could theoreticcally replace both "original" and "improved" designs.