Yes, if you are using TurboTax Desktop (CD/Download product), all of the .tax data files are compatible with both Windows and Mac. In addition, the CD version includes the software for both Windows and Mac. If you had a download product, you would need the separate Mac version.
If you prepare using TurboTax Online (website product), then your returns are all saved in your account and are accessible on virtually any computer or mobile device that has internet.
