https://www.nintendolife.com/reviews/nintendo-switch/mega-man-battle-network-legacy-collection
Additionally, the Japanese exclusive Patch Cards (like an old version of amiibo) can now be ‘scanned in’ from a menu in each game to give you some helpful goodies,
and even the side content tied to Konami’s Boktai series has been included here. None of this is game-changing, sure, but it shows that Capcom went the extra mile to ensure that this would present the old games in the most feature-complete way possible.