Color picker picks wrong Pantone color in color library

I have a Pantone swatch and a Pantone color book that contain the same colors. With the color library open in the color picker, I select a color from the swatch using the dropper and most times it gives me the correct color.
However, some times it doesn't.
I have verified that the 8 bit RGB values of the colors are identical in the color book and swatch (as shown in the info panel), but still it gives me a different color. Both files are in RGB color, with the swatch stored in 16bit and the color book in 8 bit (file format limitations).
What causes the wrong color to be selected? How does photoshop calculate the "distance" between the colors to determine which is closest? I would expect that it should select the color that has identical RGB values, even though the one it does select is relatively close in RGB space.

The color picker always fails on the same colors. My monitor profile is sRGB. Every color profile setting I know of is on sRGB and it doesn't seem to make a difference.
In the image below I've tried to show what is happening. In the top version, the incorrectly chosen color (wrong red value) is selected in the color library, while the info panel shows the RGB value of the swatch color that the mouse is over. In the bottom version, the correct color was manually selected to show that it does indeed exist in the color book. In this case the RGB value in the info panel (from the swatch) and the RGB is the color library are the same.

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