Can't say whether it would run cooler with the smaller dia pulleys, but can say the oem comp clutch was/should be the smaller one.
In theory small dia means more rotation so it would tend to make sense the smaller dia set up should be the better way to go.
I would use whatever is the most complete/matched set to eliminate belt alignment issues.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car. 
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