I have essentially the same one and will replace it the Samsung 18 cu ft. Width and depth are not an issue but there is some cabinetry mods necessary to accommodate the 71" ht vs the existing 60" or so.
Many have gone before you on the conversion so there is a lot of knowledge about what it takes. I'm going to wait till we get home than order the fridge when it's on sale. Unfortunately if yours is not working you may not be able wait for a sale. My guy has done a dozen or so and said it takes ~11 hours for the whole job.