Not exactly, and I don't have a photo to compare it so will do my best to describe the difference.
Ignoring "mark 1" which takes quite a different route UNDER Rb 3 incline.
Mark 3 comes under the bridge to tip line at a shallower angle. IE the left hand abutment in photo in photo is nearer foot of Rb 3 incline than it is in photo. After crossing the river it then turns left (about 45 degree curve) to parallel the slate wall in the photo, heading for the open quarry approaching which there is a headshunt and the line climbs back towards the mills.
Having checked last time I was there, the current bridge is definitely at a different angle to the one in the photo. I was surprised it was different myself, but it is.
On thinking about it, I might have photo, if I do I will upload in next couple of days. I will have to scan it first as it is bound to be "pre-digital".