Font of standard content section headers

Summary:

We created an additional section inside the Worker Goal page and placed a hypertext.

Content (required):

As stated above, we have created an additional section with a header, "Leistungskennzahlen". However, the client wants it to have the same font and size with the delivered content section headers. We have already tried changing the font via the edit HTML text in page composer - however, it doesn't match the delivered content headers.

As you can see from the photo below, the two underlined headers are the delivered ones and the customized one is the Leistungskennzahlen header. We need the font and size to be them same as the underlined ones below. Is this possible?