Yes you can.
As long as the hole in the blade is the same size as the arbor, you can mount any blade with a diameter smaller than the maximum your saw can use.*
The only real difference, besides maximum cutting depth, is that smaller blades are often thinner and have a narrower kerf. I was curious if this could make them unsafe to run at the same speed as a larger blade, but actually the opposite is true.
Source: Freud via http://joneakes.com/jons-fixit-database/920-Saw-blade-safe-rotational-speeds
Smaller blades can run faster since their mass is closer to the axis of rotation (I think), so they can be made thinner. But, the RPM of a smaller blade will be the same as that of a larger blade, and in fact the cutting edge will be moving slower. In other words: the blade isn't in danger.
One thing to note is that an identical cut should probably be made slower with a smaller blade, since the cutting edge of the blade is moving slower.
More specifically to your situation: The manual for the SBOX8 doesn't even mention the table saw's maximum blade size, which leads me to believe it isn't an issue. Also the SBOX8 is probably heavier than a normal 10" blade, so much of the general information above doesn't apply.
* Although it must be larger than the arbor flange, and large enough to cut things!