Can I copy an iTunes Library from another Mac
Not sure what you need past this article, but sure - you just need two folders worst case:


https://support.apple.com/en-us/HT204318


The folder where the library index and cached files exist.
The media folder if it’s not a sub folder of #1 above.



You will want to tell iTunes on the sending copmputer to reorganize all media files and copy/move them to the data folder and then run the “organize” command once or twice to be sure all the files are correct - organized and in the right folders.

Then move the two (one) folders to the new computer and point itunes to the correct location of the library. iTunes won’t merge two libraries - so be sure you don’t expect a merge on the receiving computer.