So while the scent is slightly different, the biggest difference I notice is that the KB Special seems to pack more of a nicotine punch. More leaves than stems? Different processing? Dunno.
I felt the same way about the Scotch Black. I notice both of these have been discontinued. I wonder if they were poor sellers or if the materials/methods to pack that higher punch was too expensive.
SG Kendal Brown special is still being stocked on MrSnuff
I don’t see it listed on SG’s web site anymore, and saw some post on here a while back saying it’d been discontinued. If you like it, I’d stock up! (Personally I find it too strong and will stick to the KB Original!)
Maybe stock up from mrsnuff it says they have 22, 25g tins. save a couple for me though 
I’ll have to check that aspect out next time I open a tin. I have several of each type in storage in anticipation of not being able to get them in the future.