Ram reversed but still work?

Hello,
I recently installed a new 1 gb memory upgrade, and when I checked system profiler, listed new unit as 'SODIMM1/J23REVERSED:'. It is listed and recognized, so I'm just wondering if the memory can be installed 'backwards' but still work properly? If not, just curious why the memory can be listed as being either 'standard' or 'reversed'.
thanks for your help,
charles

Just FYI, not all PowerBook G4 Aluminium models diplay their RAM in this way. I have two identical SODIMMs installed and neither are listed as reversed.

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