Please is there any difference between

"Tell me the origin of sth"

And

"Tell me how sth came to be in existence"??

ex·is·tence\ig-ˈzis-tən(t)s\
noun
1 a obsolete : reality as opposed to appearance
b : reality as presented in experience
c (1) : the totality of existent things (2) : a particular being <all the fair existences of heaven — John Keats>
d : sentient or living being : life

or·i·gin\ˈȯr-ə-jən, ˈär-\
noun
1 : ancestry, parentage
2 a : rise, beginning, or derivation from a source
b : the point at which something begins or rises or from which it derives <the origin of the custom>; also : something that creates, causes, or gives rise to another <a spring is the origin of the brook>


I'll be back to elaborate

*modified*

Am actually not much of a scholar but the two words are only similar and never the same e.g
The origin of the yoruba tribe is believed to be traced down to Oduduwa. If then "how yoruba tribe came into existence" is the question, I guess you have to go farther to the pre-oduduwa story.
Well, it may mean the same to a lame man but the truth be told :

the similarities depends on how much you twist the question. Your question could have been
Tell me the origin of something

And

Tell me the existence of something (which goes to the pre, and actual explanations.