I'd like to use this, but the thing I have saved as my private key does not start with nsec?

it seems to work so maybe it's just a different style?

pls help, don't know what to do about this/don't understand it

nostr:note170xptunrkvszltm5uk98mcxfltltcn7srt5sfwn96arwnvdqcxjsqegyfx