The frame data is the same on the close (i.e., "in place") and far razors. You always want to use the far razors for combos. The only exception is b+3,4 xx close razors, 3,2 xx d,f+2 in the corner. You also want to use the far razors for block strings. Close razors can be used in block strings too, but they depend on the character (i.e., males versus females and even "breathing" hitboxes), the type of blocking (i.e., standing versus crouching), and the spacing (i.e., the range where Kitana's initial hit makes contact with the opponent). When executed properly, the first hit of the razor hits, the second whiffs while the third hits. This gap can be used to bait and punish low pokes in between the first and third razor. The opponent can backdash the third razor, though. Finally, you can use d+3 xx close razors to bait and counter certain retaliations such as low pokes and throws, but you can be punished if your opponent decides to wait and not press any buttons.