1990 : The urgency of feminism to establish a universal status for patriarchy in order to strengthen the appearance of feminism's own claims to be representative has occasionally motivated the shortcut to a categorial or fictive universality of the structures of domination, held to produce women's common subjugated experience. - Gender Trouble by Judith Butler

So, there is considerable evidence in favour of drawing a categorial distinction between the preposition for and the complementiser for: they are different lexical items (i.e. words) belonging to different categories.

Categorial

Meaning

Adj