ice box has a wood grain front but most of these appliances the front "color" is just a panel that can be easily swapped out if you wanted to keep that avocado green original door color.
Dimensions will be the most likely issue and you would have to call Scamp
to get theirs. Or follow up on the company that makes that one Formco.
Also vintage trailer supply has them in a couple of sizes, this one and at the bottom of page a link to a different one that is smaller. Both list dimensions.
RV Ice Box
Appliances : Ice Box
One thing to consider is can you get more insulation in the space around the ice box? A couple members here have added some extra insulation to the space the ice box goes into and gained notably longer life from a block of ice. I seem to recall one was lasting about 4 days.
Good luck and welcome to the forum.