PATRIC vs. RefSeq annotation for SARS-CoV-2

Question

[vembha]

Hello,

I am trying to perform phylogenetic analyses using SARS-CoV-2 genes, like ORF1a and membrane for instance. On the bv-brc.org repository's website, gene sequences are available with either PATRIC or RefSeq annotation; refer to the picture for example:

Could someone tell me what is the difference in the context of genes and NOT whole genome? Also, what does it mean to use genes with specific annotation in the context of SARS-CoV-2?