Not really.

The climb starts pretty much as soon as you turn off the roundabout at the bottom - on the tour they use a point about 50 metres up the road, but it's an obvious place to use as the start point.

There are 2 end-points.

The 'finish' is marked clearly with a banner hanging over the road as you pass through the town and shops at the top, but the professional climb was extended by a couple of switchbacks several users ago (and for that reason you should do it too!). When you go under the banner, you'll turn left and go underneath a small round bridge, and then the race finishes when you reach the 'actual' top of the climb (you'll end up in a car park type area with some shops and chalets around you).

Pantani's time was taken to the full finish, I believe, not the 'tourist' finish. In practice there's not much between the two.