Level 200 Essence naming convention variations?

While I was updating the Wiki I noticed this and was wondering if anyone else notioced that some level 200 essences have more than 1 variation?

For example 2 different Level 200 Frost Grievvers;

http://acpedia.org/wiki/Glacial_Grievver_Essence_(200)
and
http://acpedia.org/wiki/Arctic_Grievver_Essence_(200)