For Future Beeing its better to use an CNAME so when you change the Server or the IP Address you only need the Change the A-Record for the IP Adress or the Cname if you switch servers.
CNAME ftp.mycompany.com server1.mycompany.com
A server1.mycompany.com 123.123.123.123
FTP doesn't care. In the end as long as it points to an IP address it's fine.
For Future Beeing its better to use an CNAME so when you change the Server or the IP Address you only need the Change the A-Record for the IP Adress or the Cname if you switch servers.
CNAME ftp.mycompany.com server1.mycompany.com A server1.mycompany.com 123.123.123.123