save color values from transparent pixels

[zeuspaul]

There is some kind of  difference between the two png files.  I have been making an exported file of each until I understand what is going on.  I have opened both in a new image each on a separate layer.  Then I toggle between the two layers.  When I zoom in on an edge there is a difference. The png with the color values saved is about a pixel larger than the other. I don't see any pixels that have been converted to black. This only happens with the pngs which open with the checkerboard pattern.  The option isn't there with jpgs.  If I export to jpg all transparent pixels are converted to the background color.

I don't understand.  The transparent layer is filled with black?  The transparent layer I copy to doesn't look black?  It has the look of a checkerboard. And when I open the png it still has the checkerboard.