Yes sir… you can use your same nsec (private key) and test out other clients. Try nostr:npub18m76awca3y37hkvuneavuw6pjj4525fw90necxmadrvjg0sdy6qsngq955 or nostr:npub1n0stur7q092gyverzc2wfc00e8egkrdnnqq3alhv7p072u89m5es5mk6h0 on iOS, nostr:npub142gywvjkq0dv6nupggyn2euhx4nduwc7yz5f24ah9rpmunr2s39se3xrj0 on Android, and nostr:npub1wyuh3scfgzqmxn709a2fzuemps389rxnk7nfgege6s847zze3tuqfl87ez or nostr:npub1sn0rtcjcf543gj4wsg7fa59s700d5ztys5ctj0g69g2x6802npjqhjjtws on the web. There are so many more including long-form clients like nostr:npub1048qg5p6kfnpth2l98kq3dffg097tutm4npsz2exygx25ge2k9xqf5x3nf and nostr:npub1w0rthyjyp2f5gful0gm2500pwyxfrx93a85289xdz0sd6hyef33sh2cu4x

If you’re using the web, I’d recommend using an extension like nostr:npub1getal6ykt05fsz5nqu4uld09nfj3y3qxmv8crys4aeut53unfvlqr80nfm in order to keep your private key local and not expose it to the various client’s servers.