R6700 to RS600

My understanding is "no".  Configuration saved from one model of Netgear router cannot be imported into another. Certainly would not harm anything to try.  If it gets rejected, there's your answer.  If the RS600 accepts it and goes whack-o, just do a Factory Reset.

My practice is to go through the entire configuration, one page at a time, and save screen captures to a Word file.

In the "old days", Netgear routers had telnet or ssh access to a Linux command line.  After logging in, a command would display the entire configuration.  I would save that, sort it, and have a text version of all the important information.  (sigh)