I'm guessing that The Worthing Chronicle, which according to ISFDB was originally published by Ace and expanded from a previous novel also published by them, is somehow considered separately from The Worthing Saga for the purposes of reprint rights (if it happened to get revised again when Tor apparently omnibused it).
And the latter being a Tor book would explain why Canada and the US can't see TWC, if they're technically still holding on to the rights or Orson Scott Card is just hoping that they'll pick it back up for the ebook version with their more prominent distribution system, and the original revised novel was all that Endeavour could get ahold of.
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