Site Survey with 7920 phone

I have a multiple 7920 phone and multiple AP in my environment. Some of the phones are hardware version 2 and others are version 1.
When I do a site survey with 2 phones at the same exact spot I see diffrefnt signal strengths with each phone. both of the phones are set to the same transmit power and both phones are associated with the same AP. If I hold both phones togather and walk arount both phone will show huge diffences in signal strength. I would expect to see some minor diffrences but usualy the diffrence is 10 or more.
any thoughts?

RSSI is a relative # and the 7920 averages the last 5 scans. Depending on the scan times these could be different and will almost never be indentical.
Also ensure these are both running 1.08 firmware.
There are only minor tooling differences in rev2 hardware.

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