The main thing I want to know is how different are the timings

It is basically just a slower paced trick. More unpause lag (cant repause as quickly), and cannot unpause as quickly as in HD. In addition, in this version things are visually delayed by a frame. Other than that, the mechanics of how the trick works is identical to HD. Same inputs.

Is there any good way to practice the timing?

doing the trick is the best way to practice the timing