1965 Valiant sedan vs hardtop interior/seat question

I’m sorry but I’m not sure of the details but I don’t think they are not totally correct.
I think for some years there is a difference between two and four door rear seat cushions. The four doors having the rounded corners for ingress & egress.
They may think a four door is always a sedan & two door always a coupe but that is not the case with our Valiants. And I think at some point this idea of having two cushions was dropped.