I have searched PPSC website in detail but there is no clue for such kind of information. After that I opened tab of "Download" but still result remained the same. Anyhow , Syllabus for Optional & Compulsory subjects (PMS-2019) is also available on this link.

http://www.ppsc.gop.pk/(S(v3gx50itjy...Downloads.aspx

If you have authentic information about any change in syllabus for PMS 2020 , please let us know about the source.