With a little tinkering, you can also get a Mac layout in core.
Many mac themes you can find here:
The minimal install of Zorin pro should include the layouts, so maybe you're faster with a fresh minimal install of Zorin pro.
On the website at frequently asked questions about Zorin pro you can read:
"Can I install Zorin OS Pro without the creative suite and advanced productivity tools?
Yes, while installing Zorin OS Pro to your computer you can select the "Minimal installation" option to keep just the core selection of apps, premium desktop layouts in Zorin Appearance, and additional artwork."