Yes and no.

The main benefit of activitypub is facilitating communication between many instances running the same software. Sometimes services are different but do the same thing so work well together (e.g. mastodon and firefish).

When there is overlap between services it can work, such as how you can read lemmy communities from mastodon, but it’s not the same and doesn’t display as nice because they are different content types (microblog vs link sharing and discussion).

Bookwyrm is quite different. Tracking the books you’re reading is not really a fediverse thing and I’m not sure that’s even federated between bookwyrm instances. Reviews on books, well on bookwyrm you can follow users. I guess it’s possible you can follow a bookwyrm user from mastodon? Have you tried? It wouldn’t give you the same experience though, so sometimes it’s nicer to make a new account per service type.