Consider this:
I have 3 text layers, two of which are linked to the "master" layer (via a simple "thisComp.layer("master").text.sourceText" expression).
I then change the text on the master layer to be Paragraph Text and tweak the dimensions of the bounding box. The other text layers do not update to reflect this. I suggest they should do.
Or is there a way, using text attributes in an expression, to copy the paragraph layout?