8.1 pro vs 8.1 pro with wmc

It's discontinued and dropped from 10.

Windows 8 and 8.1 Pro Pack and Media Pack are no longer available to buy

https://support.microsoft.com/en-us/help/3107057/windows-8-and-8.1-pro-pack-and-media-pack-are-no-longer-available-to-buy

As of October 30, 2015, the Windows 8 and 8.1 Pro Pack (which upgraded Windows 8 Home or 8.1 Home to Windows 8 Pro or 8.1 Pro, with Media Center) and Media Pack (which added Media Center to Windows 8 Pro or 8.1 Pro) are no longer available for purchase from Microsoft. Previously purchased feature pack licenses will still work, and valid feature packs may still be available for purchase from third-party retailers. Support for these products is still available.

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There is also this IF you had bought it:

Have a read through this from Microsoft:

Changes in metadata service affecting Windows Media Center and Windows Media Player

https://support.microsoft.com/en-us/help/4488539/changes-metadata-services-windows-media-center-media-player

Going forward, you may be unable to view information (metadata) such as the title, genre, and artist for songs, and the director, actors, and cover art for movies in Windows Media Center and Windows Media Player. After looking at customer feedback and usage data, Microsoft decided to discontinue this service. This means that new metadata won’t be updated on media players that are installed on your Windows device. However, any information that’s already been downloaded will still be available

https://www.ghacks.net/2019/01/27/changes-to-windows-media-center-and-player-metadata-service/

Cheers.