I feel like that's true for early/mid-90s games where the PC version targeted DOS (+ the varied universe of PC video/sound hardware), and the Mac version could just target the much more uniform Mac platform.

But SimCity 3000 is from 1999, and the PC version was a normal Win9x game. I own (still have the CD) the SimCity 3000 Mac port, and it is not very good. Maxis didn't port it themselves, it was done by Software MacKiev. System requirements were quite high for the time, it was sluggish, often unstable, and the file open/save dialogs reused the Windows-style dialogs which was very awkward.

The soundtrack is great though.

And when you say “PC original”, you really mean “DOS version wrapped in DOXBox”, because it's easier to ship that on both Windows and Mac than patching the Windows version for Windows, and shipping a Wine wrapper for Mac. (Have they ever shipped a Wine wrapper for anything? I don't think so.) What a shame.

I do really wish an application-level classic Mac OS emulator existed. There are lots of great full-system emulators for classic Macs (Basilisk II, SheepShaver, DingusPPC), but no Rosetta-style “make the old application run in the context of a new machine” execution environments. I'll grouse to whoever will listen that all of the best edutainment software of the '90s and early '00s is trapped on PPC Mac OS.

You can run the Windows 95 version of the game (similar to the Mac version) on modern computers with this patch: https://sc2kfix.net/ . It's definitely disappointing that GOG doesn't distribute that version. Stuff like this is why I have to keep a CD drive around.

Maybe you can play using an emulator. I use VMware to emulate Windows XP to play The Sims and it works great.