IDE Cables

40 pin cables have fat wires and 80 pin cables have thinner wires. The wires in 40 pin cables are the same size as a floppy cable. The wires in 80 pin cables are quite a bit thinner. If they look the same then they probably are the same. And 80 pin cables typically have a blue connector in there somewhere. There's a comparison picture at the bottom of this page.
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both will have 40 pin connectors (since the additional 40 wires are all ground) and aside from the obvious 80 wire count, will typically have a blue (mobo) grey (slave) and Black (master) connector
 
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