While SC will not convert backward, you can easily do it anyway - if you have the full version, simply export your radio contents to a CSV file, and reimport to the other radio. Clunky but simple.
The logic is clear when you consider that channel capacity, ect. is very different for say a 296 than for a 245. In that case you need to edit the file to reduce from 1000 channels to 300, as well as ignoring PLs, ect. Same deal applies for, say going from an 898 to an 895 (in this case, the 895 doesn't support DCS...) 73s and happy holidays...Mike