Pantone+ 7433 Solid Coated (Adobe CC wrong Lab values?)

Hi, Im often getting a request to convert Pantone-colors to RGB, Lab or CMYK.

I usually do the following (In this case I want to convert Pantone+ 7433 Solid Coated to Adobe RGB):

• New blank Lab document i Photoshop
• Choose the right Pantone from the library
• Fill the document with the aintbucket
• Convert to Adobe RGB (Absolute conversion)
• Look at the RGB value in the info panel
• Done!

But today I've noticed something strange.

The Lab value of Pantone+ 7433 Solid Coated in Photoshop is the following:

L 43
a 50
b 2

But when I measure (Spectro M0 D50 2° noPOL) on a couple of different new bought physical Pantone Swatches the color is "much" darker. And I get the value:

L 37
a 48
b 3

So my question is: Can you really rely on the Lab-values from the Pantone+ Color Books in Adobe CC?

Best regards