What would be the outcome of their DNA test?

Somehow this question popped up after watching a drama, got the urge to ask.

(In a hypothetical scenario where time travel is possible.)
A woman (lets call her M) comes from future 2080 to 2005, (38 years old) she finds she’s pregnant and gives birth to a child in the past 2005. Fast forward few years and she dies due to some reason.

Few more years later the child grows up and coincidently finds a lookalike of his mother in her 20s(Lets call her LM). She’s the past self of child’s mother. So if a DNA test is performed between LM and the child, would it match? or something else?

A little reminder, M and LM may look the same but both lived in different dimensions and conditions and are complete opposite of each other. Would it affect the outcome of DNA test?

I appreciate the answer.
Regards!