is there a thing as mmr in normals?

im kinda curious cause when i first started playing league i was kinda bronze-silver and in normals i had unranked and silver players. then i made a new account and i went plat 3 peak in solo duo and i was playing with the same style in normals and i had players plat+ (even diamond) so does normal games actually have their own mmr or they have the same with your soloq mmr?
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