4 Layer Board -PCB Stack UP

I use the Github reference project for my board. I am currently creating a 4 layer PCB with Kicad. However, I noticed that the board configuration of the reference project does not match the website.
In the reference project the outer copper layers are 0.035mm thick and here on the website 0.04mm is written.

Hi Albert, I hope you had a lovely Easter. The graphic on our webpage refers to the copper thickness + surface finish.

We are reworking our documentation, so thank you for your feedback. I will make sure to include the information.