How to copy configuration from router1 to router2 (different hardware)?
I see this post: viewtopic.php?t=115073
My question: how to export and import via Winbox GUI? (not via terminal cli!)

Short answer: you can't. export / import is cli only. backup is available through GUI

but cli command /import do not work:

expected end of command (line 24 column 26)

It does work, but fails at line 24, probably due to a different set of interfaces or features between devices.

You better open the rsc file in a text editor, select the lines by hand and paste them in the terminal.

I see a very large number of messages
expected end of command

looking at all, export/import procedure is very bugged on Mikrotik

Explain the exact steps you are doing. I have done this procedure several times with success. Just make sure the configuration you are moving is fitting the new hardware model (by making adjustments), the required packages are installed and the version matches.