Here's a direct comparison, a 1964 v 2019:
View attachment 37547
View attachment 37548
The 1964 follows the carve, the 2019 doesn't even try; 1/2 inch away most of the time... The pickup selector switch is around an inch higher on the 2019 as well, so maybe that affected how the pickguard was shaped? The top right screw is in a very different position.
Having looked at it in more detail, it's pretty nasty. I'd imagine some of the main pickguard reproducers would have already made a replacement for the 2019s and have a template. I'll send a couple of emails away and ask...