I see differences that indeed doesn't matter for me (holes in the side of the track, connection part), but I was just wandering why there are some plastic track parts in Ldraw ("Train tracks 6 studs wide": 53400, 53401) but not all of them.
The part numbering is also really weird. For example [size=small]the [color=#333333][font=Tahoma, Verdana, Arial, sans-serif]s[/font][/color][color=#333333][font=Tahoma, Verdana, Arial, sans-serif]witch point left [/font][/color]in Bricklink is 53407 and [color=#333333][font=Tahoma, Verdana, Arial, sans-serif]in [/font][/color]Rebrickable 53406. The switch point right in Bricklink is 53404 and in Rebrickable 53403.[/size]
The part numbering is also really weird. For example [size=small]the [color=#333333][font=Tahoma, Verdana, Arial, sans-serif]s[/font][/color][color=#333333][font=Tahoma, Verdana, Arial, sans-serif]witch point left [/font][/color]in Bricklink is 53407 and [color=#333333][font=Tahoma, Verdana, Arial, sans-serif]in [/font][/color]Rebrickable 53406. The switch point right in Bricklink is 53404 and in Rebrickable 53403.[/size]