Hehehehe, we ‘share’ DNA. You should really look into what that actually means - and the follow up studies to how much we actually ‘share’. Also to note, they found out junk DNA isn’t junk either.
Besides, why wouldn’t the same inventor use a similar recipe when it ‘was good’? ;)
(Hint: We just share protein-coding regions of high similarity with Chimps.... regions, not entire areas)
Remarkable similarities in DNA among species, both closely and distantly related, help confirm basic evolution theory.
Protein coding DNA especially is subject to natural selection and so retains identical features across species.
By contrast, non-coding DNA seems to have no effect on natural selection, so mutations accumulate there much more quickly.