My network works okay under b95 but it doesn't work after update to B97

On B95:
# ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu
8232 index 1
        inet 127.0.0.1 netmask ff000000
e1000g0: flags=201004843<UP,BROADCAST,RUNNING,MULTICAST,DHCP,IPv4,CoS>
mtu 1500 index 2
        inet 10.239.12.36 netmask ffffff00 broadcast 10.239.12.255
        ether 0:13:20:f6:a3:af
lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu
8252 index 1
        inet6 ::1/128
# modinfo | grep e1000g
167 fffffffff7e5d000  2f7e8 223   1  e1000g (Intel PRO/1000 Ethernet 5.2.6)

On B97:
# ifconfig -a
lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu
8232 index 1
        inet 127.0.0.1 netmask ff000000
lo0: flags=2002000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv6,VIRTUAL> mtu
8252 index 1
        inet6 ::1/128
# ifconfig e1000g0 plumb
ifconfig: cannot open link "e1000g0": No such device or address
# modinfo | grep e1000g
157 fffffffff7d86000  32f88 223   1  e1000g (Intel PRO/1000 Ethernet 5.2.11)
# prtconf -vp
----snip----
Node 0x000008
            assigned-addresses:
8200c810.00000000.90500000.00000000.00020000.8200c814.00000000.90520000.00000000.00001000.8100c818.00000000.000020e0.0000000
0.00000020
            reg:
0000c800.00000000.00000000.00000000.00000000.0200c810.00000000.00000000.00000000.00020000.0200c814.00000000.00000000.00000000.00001000.0100
c818.00000000.00000000.00000000.00000020
            compatible: 'pci8086,10be.8086.0.3' +
'pci8086,10be.8086.0' + 'pci8086,0' + 'pci8086,10be.3' +
'pci8086,10be' + 'pciclass,020000' + 'pciclass,020
0'
            model:  'Ethernet controller'
            power-consumption:  00000001.00000001
            devsel-speed:  00000000
            interrupts:  00000001
            max-latency:  00000000
            min-grant:  00000000
            subsystem-vendor-id:  00008086
            subsystem-id:  00000000
            unit-address:  '19'
            class-code:  00020000
            revision-id:  00000003
            vendor-id:  00008086
            device-id:  000010be
            name:  'pci8086,0
----snip----

# cat /etc/driver_aliases | grep e1000g
e1000g "pci8086,10be"
# rem_drv e1000g
# add_drv -i "pci8086,10be" e1000g
devfsadm: driver failed to attach: e1000g
Warning: Driver (e1000g) successfully added to system but failed to attachlsls

The interesting is, when I copied the driver (e1000g) from b95 to b97, it works.

So I guess the driver is the root cause.
# modinfo | grep e1000g <================B95
167 fffffffff7e5d000  2f7e8 223   1  e1000g (Intel PRO/1000 Ethernet 5.2.6)
# modinfo | grep e1000g <================B97
157 fffffffff7d86000  32f88 223   1  e1000g (Intel PRO/1000 Ethernet 5.2.11)

Thanks,
-Aubrey
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