Would you be able to find out what the multivariable adjustments were in the first study?
When writing reports, studies or findings its important (and common practice everywhere) to include details like this showing how results were obtained for good reason, and I dont know why the authors of that study havent done it. Or I could just as easily say "I made multivariable adjustments found women earn 29% more than men!"
While Im not saying thats necessarily what theyve done, when analysing a report you need that information.
I can go through the other article in a week or so, it has too many links which are a pain to navigate on my phone