The difference there is that you can usually find a way to buy the game itself to get access to the game media.
The source code here will be of limited use until it's heavily reworked to compile on modern systems. It's a lot of work, but not as much work as reverse-engineering the game and building an engine implementation from scratch, and this source seems like it has most of the Mac-specific stuff under a separate directory, which would make it easier than otherwise.
