Yes! Every Nostr client/app/website/etc. uses your same account and contacts. Each has its own approach in terms of how it displays info and what you can publish, but your activity and followers and the content you post on one app will be reflected in any other Nostr app that supports that type of content/activity.

That's the beauty of Nostr. We're Sovereign Individuals and our comments stay with us where ever we visit.. When you post it, it's yours.. I'm sure my posts read like a 5 year old. Sentence structure isn't my strong point! :) I'll apologize in advance for all disjointed posts..