Hello and welcome to the Mac Family! 😀
You should be able to easily transfer the files from one hard drive to the other. Obviously some files might not open on the Mac due to being different operating systems however, usually there is a built in program in macOS that should be able to open most similar Windows files. Check out the link below for details about how to move your data:
Move Your Data From a Windows PC to your Mac: https://support.apple.com/en-us/HT204087
Let me know if this helps or if you have further questions!