(A-1) ひろ子に会ったら、この手紙を渡してください。 If you meet Hiroko, please hand her this letter.
(B-1) ひろ子に会うなら、この手紙を持って行ってください。If you will meet Hiroko, please bring this letter with you.
In sentence (A-1), the incident ひろ子に会う occurs before the incident 手紙を渡す, whereas in sentence (B-1), the incident ひろ子に会う will occur after the incident 手紙を持っていく.
(A-2) ひろ子に会ったら、この手紙を持って行ってください。 (Incorrect)
(B-2) ひろ子に会うなら、この手紙を渡してください。 (Correct) If you will meet Hiroko, please hand her this letter.
Sentence (A-2) is incorrect. You cannot use ”X たら Y” when X occurs after Y. On the other hand sentence (B-2) is correct. You can use "X なら Y" regardless of the temporal order of X and Y.
(A-1) ひろ子に会ったら、この手紙を渡してください。 If you meet Hiroko, please hand her this letter.
(B-2) ひろ子に会うなら、この手紙を渡してください。If you will meet Hiroko, please hand her this letter.
Sentence (A-1) and sentence (B-2) are very similar, but different in nuance. ひろ子に会うなら implies that “if you choose to meet Hiroko.”
You can read this article in Japanese.
http://meadowlake001.blogspot.jp/2015/01/the-difference-between-and-japanese.html?q=Difference+between

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