Why ORF13 and ORF14 of Bat Sars coronavirus Rp3 have no corrispondence in Sars2?
The virus Rp3 stands for Rhi pea isolated in China in 2004.
The trees is here and groups with the Bulgarian sarbecoviruses and is closely related to the African sarbecoviruses. Thus although it is a Chinese sarbecovirus is not with the &quot;Chinease originating&quot; clade as is SARS and Covid-19.
Thats why the more mysterious ORFs ORF13 and 14 are missing, because over notable genetic distances these genes along with ORF10 are present/absent. This is a common feature of the betacoronaviruses.
In summmary this virus is notably distance from the major human pathogenic SARS/covid-19 viruses. Thus the absence of these auxilary genes isn't really surprising.
Its the very last taxa on the SARS-related viruses clade (monophyly) and is in a different group to SARS, which is the Beta-1 clade on this most excellent paper.

To answer the comment. They are outgroups, basically ancestral to COVID-19 and SARS-1 clade. So they lost these genes whilst the ingroup including COVID-109 and SARS-1 retained ORF13, 14 ... but I think lost ORF10 from memory