++Adding to the topic,

Using the "Combine Files" tool and "Convert to PDF" plugin (that are run in Adobe Acrobat),  printing a document file to a PDF using the "Adobe PDF" virtual printing driver (from any OS application), or employing "Save As" directly from a Microsoft Office program , or using the PDFMaker COM Add-in with both, Microsoft Office or through the Microsoft Windows built-in File Explorer (formerly known as the Windows Explorer), may render entirely different results. However, all of the import/export methods may rely heavily on the Acrobat Distiller customization preferences.

In which case, it is better if, before you export any Microsoft Office documents, to run the Microsoft Excel's built-in Accessibility Checker and let the wizard detect issues; it will offer the user with  options to fix the detected accessibility (or any other) issues. Once you apply the recommended fixes and save the file, you should customize a printing profile in the Acrobat Distiller program (Acrodist.exe) before you continue to experiment with any PDF conversion method(s).

Customizing the Acrobat Distiller will allow you to embedd and subset font type foundries that could be missing, downsample, compress or retain image color profile settings from the original source document, reduce file size or optimize the PDF document, in addition to customizing the page dimensions to fit workbook spreadsheets in a desired page type.

In Microsoft Windows, you may invoke the Acrobat Distiller by clicking on the Windows(logo on your keyboard) Start button, and type in the search bar "acrodist" =>> select "Adobe Acrobat Distiller" app from the context menu =>> "Open".

See official Adobe Help Center guidance here: https://helpx.adobe.com/acrobat/using/creating-pdfs-acrobat-distiller.html

See also screenshots below: