Transfer data from old server without breaking new server

I have a new instance of Bitwarden up and running successfully.
I successfully installed an SSL certificate (I’ve never been able to do this before)
I am now successfully running on ports 80 and 443. (I’ve never been able to do this before either)
I am not able to log into the new server now. I’m guessing this is because there is no data present.
I’ve read the procedure for importing the data from a previous server but if I copy the entire bwdata folder from my original Bitwarden server all of this is going to be lost.
The old config has my site as :8443 for one.
It seems like if I were to copy this other bwdata folder and overwrite the new one it’s not going to work properly.
Do I need to do something different?
Thanks in advance