Took me until your post to compare the serials .. indeed, super close to each other! Makes me wonder if maybe the scope came already in the mount and with the base to be then mounted to a rifle. The rifle serial I wouldn't bother too much upon, I don't think they were set up consecutively (when thinking about this .. is there anything known whether the SS when doing the Gew98 to K98k rifle conversions maintained the original rifle serial, or if they assigned a new rifle serial?), since I would think they'd be picking the rifles that shoot better. About the only ones I know of ever having set up sniper rifles with consecutive serialized rifle serials are the Italians in WWI. Even the US did have the Warner & Swasey scopes in certain serial blocks, but they would not do the whole block, just those that shoot better.
Unfortunately it is quite often to find the markings scrubbed over here. I suppose post WWII not many wanted to be caught with SS marked items.