A chimpanzee and a gorilla have more difference in their DNA than a chimpanzee and a human.
The two closest related apes are humans and chimps.
We have 60% of the same genes as a fruit fly, but they are not the exact same DNA. For example we both use the gene for the hemoglobin protein to carry oxygen, but the DNA that codes for the genes has different DNA and different Amino Acids in the protein.
>> The two closest related apes are humans and chimps. <<
If by most closely related you mean sharing the highest portion of DNA. But that’s a little like saying that my Ford is more closely related to my lunchbox than to my Saturn. (The Ford and the lunchbox are both steel. The Saturn has a higher component of plastic.)