Unless I have misunderstood your question but the Surly FAQ says they're NOT the same shell spaced differently...
FAQ on Surly site seems to be talking about the New hubs but the current ones are Ultra New. Not sure which @bjf has/is talking about as I can't see the nuts/bolts in his image. @oheyitsdrew double check if the hub you are looking at on ebay is New or Ultra New, I've seen them listed incorrectly before.
Going by the FAQ the 130 and 135mm versions of the New hubs have different chainlines which would mean different hubshells.
If the chainline is the same between the 130 and 135mm versions of the Ultra New hubs (what it seems like bjf is suggesting) then I'd be hella surprised if the hubshells were different.
Scratch that, they'll need to be different shells to account for the disc spacing won't they.
FAQ on Surly site seems to be talking about the New hubs but the current ones are Ultra New. Not sure which @bjf has/is talking about as I can't see the nuts/bolts in his image. @oheyitsdrew double check if the hub you are looking at on ebay is New or Ultra New, I've seen them listed incorrectly before.
Going by the FAQ the 130 and 135mm versions of the New hubs have different chainlines which would mean different hubshells.
If the chainline is the same between the 130 and 135mm versions of the Ultra New hubs (what it seems like bjf is suggesting) then I'd be hella surprised if the hubshells were different.Scratch that, they'll need to be different shells to account for the disc spacing won't they.