Is there a difference between the older Les Paul pickguards and the newer ones, or is it a "one size fits all" kind of thing?

I recently bought a pearloid pickguard for my '98 Gibson Les Paul Standard and it did not fit properly; the screw holes did not match up and the pickup-cutaway seemed to be a few centimeters wider than it should have been. I took it back to the store where they tried it on a '06 model and it fit perfectly.

Any help would be appreciated! Thanks!

Oh, and I'm new to these forums so hello! *wave*
Anybody have any ideas? I'm afraid I won't be able to customize my guitar...