Sequence 6 marks the end of the most linear, restricted part of the game. By this point:
No. Console saves are encrypted and signed to your PSN/Xbox Live ID. There is no legitimate way to cross-convert. You would need a console-specific save via Save Wizard (PS4) or Horizon (Xbox 360), but that’s risky. Assassin 39-s Creed 3 Sequence 6 Save File Download