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HD3SS3412: HD3SS3412RUAT vs PI3PCIE3412ZHE, design review

Part Number: HD3SS3412

Hi 

1. can HD3SS3412RUAT replace PI3PCIE3412ZHE without BOM change?  are they p2p and BOM 2 BOM design?  

2. can we connect NC pins (8, 18, 42) together, and floating?  

3. plz review the schematic and have comment.