[SI-LIST] Impedance confusion

Hi Team,

Between these two stackup, 
a) SIGTOP-PP(5 mils)-SIGINNER1-PP(22 mils)-SIGBOT
b) SIGTOP-PP(22 mils)-SIGINNER2-PP(5 mils)-SIGBOT

While computing the impedance of the SIGINNER* layer,
it is offset stripline or edge coupled offset stripline.

Would the impedance be different between these two cases?
I ask this because, when board (a) is rotated it becomes
board (b) and hence I do not expect impedance to vary between
these two stackups. 

Can anyone please confirm/clarify on this.

Thanks,
-LN
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