I've been messing with some iBook last year. Here's my take on your situation:
1) you might need to check besides the physical look of the connector. You also need to be very sure the video output from the iBook can sync with the LCD you going to get. It's safer to get the similar model from the same manufacturer.
2) does the digitizer have Mac driver support?

It's easy when you have the exact part number and google for more info about them. Let's say 12" iBook G4 uses LG-Philips LP121X04. I will then look for what other model that will compatible. Without the need to mess with firmware to get the LCD synced manually.