I'm looking at replacing the floor liner in the trunk of my 96 hatch but am mostly finding liners for sedans.

Does anyone know if there is a difference in the shape of the floor between the trunks?

 

Are you looking for the carpet or the board? Either way, the floors are quite different between the hatch and the coupe/sedan.

I got a replacement board from here, it's quite an upgrade from the original: Trunk Board - Home
Best bet for carpet is likely going to be trim-to-fit, but that's easy peasy if you have the original and not much harder if you don't. Honda Civic Trunk Mat Material By The Yard (stockinteriors.com)

Is the trunk carpet integrated with the back of the seat like it is on the sedans and coupes?