hi

I understand that hg19 and grch37 are the same except for some annotation.

In my case, the hg19 reference sequence was obtained from ucsc, and there is no grch37.

However, I have, it was mapped to grch37 sequenced file( .bam format)

If hg19 and grch37 are the same except for some annotation, I wonder if hg19 can be used in future operations such as Base Quality Score Recreation, Variant Calling, etc., even if they are mapped to grch37.

If not, can I know how or site to download grch37?

sincerely yours