Blog moved and now comments and articles do not match

Hi,

1
We copied wordpress blog to another domain https://nakitjamutsi.wordpress.com/ to https://www.nakitjamutsi.com/ with import/export function. We didn’t do redirecting yet, because comments are “kind of” missing. Comments and articles don’t match. Also keywords (finnish word: avainsanat)appear in articles, but not in the sidebar as they used to.

2
My friend has also upgraded version of Hemingway Rewritten theme in blog. There’s a free Hamingway Rewritten theme, but can she some how use her upgraded features in her new blog.

I appreciate your help.