SLI & Bios question

[Soffball]

I have a 7800gt sli system with one card a 518 and one card a 516.
The 518 specs in Riva Tuner look like this

$1100000002 Version : 5.70.02.13.8B
$1100000100 BIT version : 1.00
$1100000200 Core clock : 475MHz
$1100000201 Memory clock : 1050MHz
$1100010000 Perf. level 0 : 445MHz/535MHz/1.40V/43%

And the 516 specs like this

$1100000000 Title : G70 P317 SKU 0002 VGA BIOS
$1100000002 Version : 5.70.02.13.7B
$1100000100 BIT version : 1.00
$1100000200 Core clock : 475MHz
$1100000201 Memory clock : 1050MHz
$1100010000 Perf. level 0 : 470MHz/550MHz/1.40V/43%

Now my questions...Are both cards running at 470? Thats what the nvidia control panel shows as clock speed. Or is the 518 running at 445 and the 516 at 470?

Also does having 2 different bios's make a difference? Can I flash one card and not the other? Thanks for any info.