A boy named Sioux
While there may be some variation in the size of your Swamp Orc cards, there may also be some variation in the size of your sleeves. I would recommend going through your already sleeved cards and checking for some sleeves that fit more loosely than others. Then try those sleeves on the Swamp Orc cards. I would also try all of the Swamp Orc cards, not just 10, as there may be some variation in them and some may fit your remaining sleeves.
If that doesn't work you'll need to buy more sleeves, perhaps a different brand.
All my other cards fit perfectly without problem and that's every faction that is out aside from the problematic Swamp Orcs. Putting any of these cards alongside the Swamp Orcs, I can see that they are around 1-2mm larger width ways. Also, putting all the Swamp Orc cards on a flat surface, I can see no variation in the sizes. It's really aggravating.
First of all don't panic! There are sleeves 60x92 size so you can use these. 2,5mm wider isn't such a big deal!
Another more risky option which i used for my copy of Day & Night
was to slightly trim the cards so they fir into sleeves! I used a circular cutter to trim them and a corner rounder to round the corners.
Thanks. I think I'll have to go for the larger sleeve size. Cutting just sounds TOO SCARY.