Bridgestone exedra max

This is the E-Max I recieved from Rocky Mountain on Wednesday. And an image of the tire it’s replacing!
 

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Is this an 'old' stock issue and the newer design or maybe the other way around?? Just tried google and there are 2 versions, 1 with centre groove and 1 without. Both seem to have the same name and ratings but the G852 is called the Variant G...????
 
I brought my bike in to get some work and have tire mounted, I'll have to check the date when I get it back.