The default font for the Basis theme is different than the default font for the Office theme.

Basis Theme

A fundamental style or template in software that provides the foundational design and format settings for documents and presentations.

Default Font

The pre-selected or standard font set by a software or document template, used unless changed by the user.

Office Theme

A set of formatting choices including colors, fonts, and effects designed to provide a consistent look across all the documents and presentations created in Microsoft Office products.