Yoshida stated that they will be sharing Striking gear. Last time Yoshida mentioned that in regards to NIN, all Striking gear pre-2.4 received DEX stat on it and was available to ROG and NIN (besides AF). So it's fair to say that all MNK gear pre-4.0 will be shared with SAM, including accessories as he did not mention its main stat would be DEX, which implies it's STR.