You do not "import" the tax file---you transfer it. You can transfer a tax file from a Mac to a PC, or vice versa.
How to transfer last year’s return? https://ttlc.intuit.com/questions/1900883
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/transfer-last-y...
https://ttlc.intuit.com/community/entering-importing/help/transfer-last-year-s-return-to-turbotax-fo...
https://ttlc.intuit.com/questions/1900883-how-do-i-transfer-last-year-s-return-to-turbotax-online
https://ttlc.intuit.com/questions/2262857-when-transferring-a-tax-file-what-information-carries-over...
