NO
Cassie and Diana SURELY know each other, since the NEW52 Diana and NEW52 Cassie knew each other and Diana teamed up with Cassies father AND also called Cassie her niece.
In Pre-Flashpoint Diana mentored Cassie..
AND Cassie just came randomly to Metropolis WITHOUT haven been brought back..
So I think its more problematic if CLARK recognize CONNER and BARRY recognizing BART.