I have to search, but I posted awhile back about the weight difference and got confirmation (from AJ) that the 41 lb spec was an error. I think the sd60 is 2 or 3 lbs more than sd7.
That’s one heck of a mistake to have on a spec sheet, if that’s the case. Rather sloppy.
For customers who can’t see an item before they buy, they rely on spec sheets, videos, and feedback from other players.