I'm on both and intend to find out. I suspect that is not possible though. You can follow your Funkwhale account from Mastodon, yet you can't lookup and follow any mastodon accounts.

I thought funkwhale is dead

Edit: last time I checked, the funkwhale.audio website was offline and I could not find a maintained Git repo, but now the site is online and the Git repo has had recent updates. I don't know what happened