You get a bonus disc if you buy both sets on Konamistyle. The bonus disc seems to be a reprint of MIDI Power Pro 6 with additional tracks, whatever that means.
At least they're not vinyls with CD rips on them. They're discs with CD rips on them. I can play them on my DVD player and my portable CD player.
More seriously, who knows which discs are straight ports of older releases and which discs are new recordings. I guess at least the new games like LoD and Legends will be new and hopefully clean recordings with proper beginnings, loops and fade-outs.
This is also the first CV-related thing sold by Konami I'm buying after 2010's BEST MUSIC COLLECTIONS BOX, woah 11 years ago. That one was 21,000 yen with 18 CD and a DVD. This one's 28,600 yen with 26 CD.