User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-38078079-20200816115845/@comment-24258073-20200816121140

For the first one, it doesn't look like you'll lose any of that stuff. But you may need to modify your CSS code to make it work on UCP.

Not sure about the second one, but I'm pretty sure that will be improved as well.