> Voltage was EXACTLY the same... 
Actual voltage was the same, or rated voltage marked on the wallwart
was the same?  There's a huge difference between the two.
 > Come on... explain that one, eh?  Bet ya can't
You lose.
Explanation #1: The wallwart or the device you plugged it into failed
for other reasons (eg, a small scrap of something conductive fell into
it), synchronously with your switching wallwarts.
Explanation #2: The device is (well, was) picky about its input voltage
and you switched from a regulated wallwart to an unregulated wallwart;
see the previous discussion about how unreg wallwarts' output voltage
varies.
Explanation #3: You made a mistake when checking voltage and polarity
(eg, you checked a wallwart other than the one actually used).
Oh, and lest we forget:
Explanation #4: You're a troll.
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