Cant replace Hyper 30 with the new Damage Diffusion Sys 2

Joined Mar 2013 Posts: 15
The Hyper 30 and Damage Diffusion Sys 2, have the same 4 attributes, but the DDS 2 has higher states. Game wont allow me to swap out the hyper 30 and put DDS 2 in its place, saying game only allow 1 of this kind. 
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