The difference between a DNA test for genealogy and a WGS (Whole Genome Sequencing) test is that the test for genealogy obtains values for about 700,000 SNPs (Single Nuleotide Polymorphisms), whereas the WGS obtains the values for all 3 billion positions in your genome. For genealogy purposes, the 700,000 are enough, because they are picked from among the 10 ...
Ignore the cM value offered by the One-to-One tool, as a cM is just a STATISTICAL APPROXIMATION, instead check the offered SNP comparison values, it should read: "100 Pct SNPs are full identical".
FYI: The SNP count offered for the comparison CAN'T exceed the SNP count of the smaller AncestryDNA v3 kit.
If you were to run the "DNA File ...
Each genealogical testing company selects a proprietary portion of the approximately 700,000 SNPs to include in their test and this changes over time with different versions of their test as they evolve:
v3 11/2010 to 11/2013
v4 11/2013 to 08/2017
v5 08/2017 to at least 01/2020
according to their API since 11/2007
v1 01/2012 to 05/2016