Hi Lata,
depending on the method you use, the only difference you will get is in the start and end dates of activities, and the way you compute them (for both the forward and the backward pass), but the activity duration remains the same—regardless of the method you follow.
For example, if activity starts on Day 1, you will compute EF = ES + duration - 1; if activity starts on Day 0, EF = ES + duration.
Hope this helps,
Gabriella