Unknown Roman Coin #18 [Resolvido]

Hello all,

I have a roman coin from the reign of Diocletian but I cannot seem to find the coin that is applicable to the details of this coin. 

Hope to hear what this is!

Yes, Diocletian, reverse IOV ET HERCV CONSER AVGG.

Now it gets strange, there are two entries here, one for RIC V.2 #323A and #323C:

N#306172 

N#306173 

I would need some help in differentiating the two.