Mk I/MkII Aft Cabin Size

[Mark Wey]

I am looking to replace the aft cabin cushions with a decent mattress. My long term plan is to move up in boat years from a 1990 model to a much newer model C-34 and I want to bring the mattress along. (Should be my last sailboat) I am pretty sure the Mk2  hull is wider aft. I don't think there is that much of a difference but thought I would ask the question. How much of a difference in the aft cabin size is there between a MkI to a Mk2? Is it enough to worry about as far as the size of the mattress is concerned?

Regards,

Mark