| Mike, the sintered plates tend to be of the performance variety and use different materials to provide the friction faces on the driven plates. They tend to be more metallic in content, hence the sintering process is used to bond them to the alloy plate.
Standard plates are more "fibrous" in their make up and appear to be "pressed" or bonded to the plates.
The sintered plates feel a little more grabby in some cases, simply because they have a higer coefficient of friction and once the clutch starts to take up it does so more quickly. You'd find yourself riding around this prettu quickly and soon not noticing it at all.
As for the ST clutch pack, if your basket is in decent nick, the clutch will go straight in, as per normal fitment. | 
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