Compared were the uncut R-Rated VHS by Miramax Home Entertainment and the uncut FSK 16 DVD by Laser Paradise (Unrated).
There are in total 3 differences of 3 seconds:
1 Cut = 2 Seconds.
1 Alternative Scene = 1 Second.
1 Alternative Scene without Runtime Difference.
Danny Boyle's "Trainspotting" (Great Britain, 1996) was at first released in the USA as a slightly cut R-Rated VHS. Two sex scenes and a scene of the leading actor Ewan McGregor putting a syringe with heroine in his vein were removed. The later US releases were uncut, also with an R-Rating. In some cases the new editions were called Director's Cut, but it's just the uncut original version, which was available in the most countries right from the beginning.
The sex scene of Renton and Diane is longer.
They are shown again having sex. Renton has an orgasm, the camera tracks in on him. At this point, the R-Rated version shows cheering people at a soccer game which is on TV. The R-Rated sets in again simultaneously with the Unrated, when the camera tracks in on his face and he sighs with relief.
No runtime difference
There's a close-up of Renton's arm when he puts the needle in his vein. In the R-Rated version his face is shown throughout this scene.
R-Rated: 4 Sec
Unrated: 5 Sec