Can someone tell if these iptables are equivalent?

**Version 1**

```
$IPT -F
$IPT -X
$IPT -t nat -A POSTROUTING -s 192.168.0.1/24 -o eth0 -j MASQUERADE
$IPT -A FORWARD -j ACCEPT -i eth1 -s 192.168.0.1/24
$IPT -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
```

**Version 2**

```
$IPT -F
$IPT -X
$IPT -P INPUT ACCEPT
$IPT -P FORWARD ACCEPT
$IPT -P OUTPUT ACCEPT
$IPT -t nat -F
$IPT -t nat -X
$IPT -t nat -P PREROUTING ACCEPT
$IPT -t nat -P INPUT ACCEPT
$IPT -t nat -P OUTPUT ACCEPT
$IPT -t nat -P POSTROUTING ACCEPT
$IPT -t nat -A POSTROUTING -s 192.168.245.0/24 -j MASQUERADE
```

What I find confusing is that *Version 1* doesn't have explicit ACCEPT rules and an postrouting accept policy.