No and no. I would compare the lengths of the two saddles. If they sre the same, put the nose of the new saddle just ehere the old saddle was. Then make corrections based on how you sit on it. You can measure your knee position relative to the pedal spindle and adjust the new saddle to give you the same. Or just by comfort. If the new saddle is longer or shorter than the old one, adjust the starting point of the nose by half the difference in front or behind the old saddle position. . Again follow up with fine tuning.

Good luck