I have some Genomic coordinates based on hg19 which is equal to GRCH37 and I would like to analyze these coordinates using actual genome sequences. In Ensembl, There are several releases of Grch like GRCH37.70 and GRCH37.75 etc. I am wondering what is the actual difference between all these releases of GRCH37 ?! Are the coordinates the same for all these releases?!
This is the website of the Genome Reference Consortium, might be informative for you to poke around there
hg19 is typically thought of as a subset of GRCh37 with the GRCh37p# representing different minor / patch releases (changes do not affect coordinates)
Ensembl uses a different versioning system, you can find their list of changes here: http://www.ensembl.org/Help/ArchiveList though it seems like the latest release is mostly schema changes with some changes to annotations.