It'll have to be exactly the same model, and preferably of a similar age too as Apple to slightly change their production over the lifespan of a model. And yes, it's not too difficult to replace the LCD as long as you're gentle.
It may be cheaper to buy just the LCD though, as that same panel is almost certainly used in many other laptops (not just Macs!) too. Get the panel's manufacturer and model number off the sticker on the back of it, and search ebay and other online shops for that panel. I think they're made by LG or Samsung in the non-unibody Pros, but I could be wrong.
It also widens your search, knowing what other laptops it's used in as chances are it'll be cheaper to buy a dead PC laptop with the same panel than a dead Macbook Pro.
For example, the non-unibody Macbooks use an LG LP133wx1 panel...the exact same one is also used in Acer's high end models, Toshibas and a couple of Sony Vaios. Price when sold as a Macbook LCD...£180. Price when sold as an LG Lp133wx1...£70. Exact same thing!