Hello again guys. If you want to share files from a linux box to a windows box, you will need the samba server to do that. As you learned above, you can see windows from linux with just samba client, but to serve clients, you need to be a server. You can set the 2nd linux box up as a smb server as well, or it may be simpler to have all the sharing between OSs done by the single samba server.
What I mean by that is the linux box without samba server running can see the full-time samba server, so why not make your lives easier and put the files you want shared from the 2nd linux box onto the samba server in a new directory? That way all the computers on your network can see them, and the only thing you have to do is create a new directory on the samba server and populate it with the files from the 2nd linux box?