Upgrading from CentOS 6.2 to RHEL 7.3

Upgrading from CentOS 6.2 to RHEL 7.3:

CentOS 6.2 uses iptables for firewall.

1) If iptables-services are NOT installed on RHEL 7.3, will the firewall still work if firewalld is disabled after you have imported the old iptables from CentOS 6.2?

2) Would /etc/hosts.allow and /etc/hosts.deny be able to act as a firewall if neither firewall (firewalld or iptables) is running?