Ok.. so it was Creative doing their normal... use the same model number for different cards thing. Either the firmware is different or the firmware detects the slight differences in configuration and changes the ID that the setup program detects.
Pretty sure this is the same as your card - Fatyal1ty FPS SB0460
The attachment Fatal1ty FPS SB0460.jpg is no longer available
And the XtremeMusic SB0460
The attachment XtremeMusic SB0460.jpg is no longer available
The only differences I see are that the Fatal1ty FPS has the LED block and there is no jumper on the EXT header.
What happens if you unhook the front panel and install the jumper where it is on the XtremeMusic card? Does setup see it then?
I really should just install the Fatal1ty card I have in a test setup but since you already have one installed... and I don't have the front panel.