Answer a question with a question?Why not just answering the original question if you have the answer.
Is it out of production then when was it's last production date?
If a drive is produced over a few months time the manufacturing could have been tweaked,parts updated or place of manufacting relocated.
It's logical to hope a same model would be improved after day one in production.
Now that there's a 755SA the 716SA is history anyway.