You can see the difference here in kernel boot message

doesn't work
pci1 at ppb0 bus 1
em0 at pci1 dev 0 function 0 "Intel 82571EB" rev 0x06: intx, address
00:15:17:2e:8a:38
em1 at pci1 dev 0 function 1 "Intel 82571EB" rev 0x06: intx, address
00:15:17:2e:8a:39 

works
pci1 at ppb0 bus 1
em0 at pci1 dev 0 function 0 "Intel 82575EB" rev 0x01: msi, address
00:1b:21:23:08:0b
em1 at pci1 dev 0 function 1 "Intel 82575EB" rev 0x01: msi, address
00:1b:21:23:08:0a


the 82571 is in intx mode while the 82575 is in msi mode, the kernel source
states that 82571 can't do msi so it's the expected behavior.
though it should work so something is fishy here.



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