Join Date: May 2004
Location: Wilmington, DE
Bikes: 2016 Hong Fu FM-079-F, 1984 Trek 660, 2003 Specialized Hardrock, 2004 LOOK KG386i (RIP), 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2016 Islabikes Beinn 20 (son's)
Mentioned: 6 Post(s)
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Quoted: 496 Post(s)
The plates probably have some very minor differences hence the markings. Regardless, if one pedal is more difficult to clip into and both are set to the minimum tension, check your shoes to make sure the rubber sole isn't interfering with the pedal. If it is, you can either center the cleat more or if that's not possible, use a knife to trim away any excess rubber. Also try lightly oiling the springs and see if that helps.
If you can live with the higher tensioned pedal, then the other option is adjusting the easier one to match. It could just be a manufacturing tolerance issue stemming from the torsion spring.