This might be a good place to post this question, since the "Logos 5" forum is now dominated by 5.1 crash reports.
I'm sure Logos has a file displaying the verse differences between the Rahlfs LXX and the Swete LXX (and perhaps this is asking too much, the Gottingen LXX), since, for one thing, Logos has worked extensively with them (I have purchased most of Logos products related to these resources).
Is there any chance Logos could share this file? I believe Rick Bannan, who has done a lot of fine work on these resources, occasionally visits this forum. An email to him might get a response, but if it doesn't, maybe there is someone else on this forum who has or knows of such a file, and would be willing to share it with us. It's worth a shot.