Hello,
If you are wanting a similar to color to what is listed but in 14ct. then you could use a 14ct. Lambswool, 14ct. Natural, 14ct. Naturual Rustico....anything along those natural/earthy toned colors. You can go to our 14ct. fabric page and select whatever color you choose to use:
http://www.everythingcrossstitch.com/wichelt-14-count-aida-51-width-mrp-p18073.aspx
Switching out fabrics is best left to the stitcher to decide but those listed above are my suggestions if you are wanting to stay close to the original fabric color.
~Kristi @ ECS