Wil is right. You should be able to move your Windows 10 virtual machine from Windows VMware Player to Mac VMware Fusion. Just copy the virtual machine to your Mac and it should run.
I used to work at a company where we developed kernel and user level software for many operating systems, and we frequently moved VMware virtual machines hosted on Macs and Linux and Windows hosts for testing. The virtual machines also ran many operating systems - Windows (many versions), Linux (several distros), and Macs (many versions). It all worked seamlessly, and it is one reason why I appreciate VMware Fusion on my Mac so much - the interoperability of virtual machines on all of the popular host operating systems.
About a year ago, my father-in-law's Windows XP computer failed and he replaced it with a Windows 7 computer. (Don't ask me how hard it was to find a new Windows 7 computer at that time!)
I used some Linux-based tools to recover the data from the old hard drive, and then converted it into a Windows XP virtual machine on my Mac. From there, I copied it and let my father-in-law run it in VMware Player on his new Windows 7 computer.
So - I never moved a Windows 10 virtual machine from VMware Player on Windows to VMware Fusion on Mac, but I have a lot of experience moving VMware virtual machines between different host operating systems, and they worked for me.
Here are a few hints:
* Make sure that the virtual machines are shutdown before you migrate them.
* Whatever you do, keep backups as you work. Large inexpensive hard drives help.
* I keep virtual machine backups in ZIP files. On Mac there is a right-click Compress feature. ZIPed virtual machine files consume only half the disk space as full copies.
* If possible, delete the snapshots and shrink the originals before you migrate them. You might make a ZIP backup of the full virtual machine first, then delete snapshots and shrink the virtual machine before the final transfer, knowing that you made a complete, full backup (in its original form, with snapshots intact) just in case.
* If you are technically savvy, keep an MD5 hash (or similar checksum) in a text file with your ZIP file backup, then check it again when you copy it to another drive or system. That way, you will know if the copy is perfect or not. I found a serious RAM problem in one of my computers when the MD5 hashes did not match after copying them.
* Set aside a lot of time for copying and backups. Virtual machines consume many Gbytes of disk space.