In the absence of congenital heart defects, individuals with situs inversus are phenotypically normal, and can live normal healthy lives, without any complications related to their medical condition. There is a 5–10% prevalence of congenital heart disease in individuals with situs inversus totalis
The rest of that paragraph: most commonly transposition of the great vessels.
From my read, yes, sometimes not everything is mirrored. But, also, a problem with the cilia can be a cause of the organ reversal. This will cause additional health problems.
Just trying to be helpful. Hope that answers your question.
In the absence of congenital heart defects, individuals with situs inversus are phenotypically normal, and can live normal healthy lives, without any complications related to their medical condition. There is a 5–10% prevalence of congenital heart disease in individuals with situs inversus totalis
https://en.m.wikipedia.org/wiki/Situs_inversus