A little thing: I noticed that when Elizabeth encounters Darcy the morning after his proposal, he is considerably farther away than he is in P&P2:

After walking two or three times along that part of the lane, she was tempted, by the pleasantness of the morning, to stop at the gates and look into the park...She was on the point of continuing her walk, when she caught a glimpse of a gentleman within the sort of grove which edged the park: he was moving that way; and fearful of its being Mr. Darcy, she was directly retreating. But the person who advanced was now near enough to see her, and stepping forward with eagerness, pronounced her name. She had turned away; but on hearing herself called, though in a voice which proved it to be Mr. Darcy, she moved again towards the gate.