FMS Nexus 63 power cables

Can anybody clarify the difference between FMS Nexus 63 versus the Nexus 63-L power cables?  I have enjoyed using FMS Nexus and Zero interconnects and speaker cables for years but can’t find any info on these two power cables.  Thanks for any info! 
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I believe the L has a solid core ground wire. Both versions are designed to lower the noise floor. Both are extremely good cables. Definitely prefer the Nexus over my Nordost Valhalla 2 power cable. Problem is the Nexus cords rarely ever pop up for sale.