Your PF configuration file contains at least one reference to a network interface that does not exist on the new system.
A network interface reference contains the name of a driver, followed by a number. Examples include
em0, vr1, dc0, fxp3. They are dependent on the specific hardware in each system.
You can learn what they are on each of your systems by reading your dmesg(8) or by using ifconfig(8).
There are many different drivers for many different network interfaces. Just look at how many different Realtek drivers there are, and that is only one brand of network interface chipset vendor:
Code:
$ man -k realtek
re(4) - Realtek 8139C+/8169/816xS/811xS/8168/810xE 10/100/Gigabit Ethernet device
rgephy(4) - Realtek 8169S/8110S/8211B/8211C 10/100/Gigabit Ethernet PHY
rl(4) - Realtek 8129/8139 10/100 Ethernet device
rlphy(4) - Realtek 8139/8201L Ethernet PHY
rsu(4) - Realtek RTL8188SU/RTL8192SU USB IEEE 802.11b/g/n wireless network device
rtsx(4) - Realtek SD card reader
rtw(4) - Realtek RTL8180L IEEE 802.11b wireless network device
rtwn(4) - Realtek RTL8188CE PCIe IEEE 802.11b/g/n wireless network device
ure(4) - RealTek RTL8152 10/100 USB Ethernet device
url(4) - Realtek RTL8150L 10/100 USB Ethernet device
urlphy(4) - Realtek RTL8150L Ethernet PHY
urtw(4) - Realtek RTL8187L/RTL8187B USB IEEE 802.11b/g wireless network device
urtwn(4) - Realtek RTL8188CU/RTL8188EU/RTL8192CU USB IEEE 802.11b/g/n wireless network device
$