let us assume that the IP address of your FTP server is 192.168.1.1/24, your access list would look like this:
access-list 101 permit tcp host 192.168.1.1 any eq ftp
access-list 101 deny ip host 192.168.1.1 any
access-list 101 permit ip any any
The first line permits FTP traffic from your server to any destination. If you want the destination to be only the other FTP server, you can substitute the any keyword with the IP address of the other FTP server.
The second line denies all other traffic from the FTP server.
The third line allows all other traffic from other addresses.
Apply this access-list outbound to the interface where the FTP server is connected to, e.g.;
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