What is the difference between the two other than being able to shoot quicker?
Recoil.
noise level.
reliability.
aftermarket add ons, Im guessing the sks wins hands down here.
Thanks
You might be mistaken if you consider the SKS the hands down winner. If both rifles weigh the same, the bolt gun will probably recoil a bit harder, but so what; a 7.62X39 is no .30-378 Weatherby. Noise levels are dependent upon barrel length, so usually a bolt gun with a longer barrel generates less noise, but if you're shooting multiple rounds, in a nonhunting recreational shooting situation, you should be wearing hearing protection regardless of what rifle you're shooting.
The reliability factor between the bolt gun and the SKS in all honesty is a wash, provided both examples are in good working condition. With respect to aftermarket add on's, we need only look at scope mounting options to put the bolt gun well out in front. The SKS was meant as an iron sight battle carbine, so it was not designed with convenient mounting systems in mind, whereas a bolt action like the CZ-527 makes mounting a scope simple.
Neither does the SKS shoot quicker in the context of making the first shot. I'm willing to bet any amount of money you can afford to loose that a bolt gun of a handy size, with a good to excellent trigger, will fire the first shot, at an unexpected target, much more quickly than the little battle carbine, with it's typical long, gritty trigger pull. If we consider the length of time it takes to acquire a second target, and make the shot, the SKS might not even be able to keep up for the subsequent shot, although it should have the advantage for subsequent shots on the same target.
The quality of the trigger is what truly sets the bolt gun apart from the SKS, and is the primary reason why the bolt gun can be fired more accurately, and more quickly for a precise first round hit, under field conditions. If you want a fast talking toy, or a home defense carbine, the SKS is as good as anything, and its much less expensive than a Mini-14. But if you care about marksmanship, its not where you should be looking, unless you intend to spend a great deal of money slicking it up.