All of that info is on Foxpro's web site.
I don't know about the X24, but I own both a Fusion and a CS24C. They are entirely different calls. The fusion is enclosed in a plastic case, it has 2 speakers and with that feature you have more ability to manipulate sounds (Fox Fusion, etc.). I actually think that the Fusion is more compact and easier to carry. It used 8 AA batteries.
The CS24C uses 1 horn speaker, maybe it is a little louder, it takes 10 AA batteries, and it is a little more cumbersome to carry. I use the CS24C, I keep the Fusion as a spare.
Both are very good calls, you can't go wrong with either one.
I do think that it is easier to load sounds on the Fusion.