It's not a direct bolt-in swap if that's what you're asking.
1. The mounting to the transmission is exactly the same, clocking and bolt pattern
2. I believe the 42RLE requires a short input shaft, which means you would need a 231 from 2003 or later. If you have a manual trans it doesn't matter.
3. Driveshafts have different size u-joints so you would need your shafts modified or find larger yokes to put on your 231, if that exists.
4. I don't know if the yokes end up in the same place or not, which would require additional driveshaft modification or replacement.
5. I know the Savvy cable shifter is different for 231 vs 241 which implies the transfer case selector connects differently, but I don't know how.
Most people go the other way. I suppose with 2 new shafts and a cable shifter it might still be a little cheaper than a replacement 241, but the money saved wouldn't be worth losing 4:1 low range, in my opinion.