I've heard more than once, that people and chimps share 98% DNA. Only 2% is different.
Humans and chimps are 98% the same in GENETIC DNA - the DNA that makes up a gene - one that produces a RNA transcript that codes for a functional protein. Over the entire genome we are about 94% the same.
And mixing in 4% of something that is over 90% the same when you started (humans and neanderthals) doesn’t add up to a 4% difference.