You need to understand the history of the CF and the capabilities of the respective machines. The understanding necessary to "root" the Foxsat and HD-FOX/HDR-FOX was first developed by Raydon on the Foxsat, and then af123 cracked it for the HDR-FOX. The Foxsat is less powerful than the HDR-FOX, and they have differing capabilities (eg no DLNA server on a Foxsat) and differing inconveniences in the design of their stock firmware. Therefore, initially, the two user groups had different priorities. So the Foxsat and HDR-FOX CFs were separate developments.
However, they are sufficiently similar to be able to port (with modification) software from one to the other, so the Mediatomb package (for example), first ported to the Foxsat to make up for its lack of DLNA, got picked up by the HDR-FOX CF (where it can be useful if somebody wants to store and stream media files that are not compatible with the stock DLNA server - a niche requirement!).
Because of af123's enthusiasm and developing software skills, the hardware capability of the HDR-FOX, the enthusiasm and contributions of the HDR-FOX community, and possibility that we have our own forum instead of being hobbled by Raydon's choice to support the Foxsat CF only via a avforums, the CF developed much further than the Foxsat CF.
If you had looked at the Foxsat CF 5 years ago (maybe), the front end would have looked completely different from the HDR-FOX's relatively slick WebIF. MofTot (I believe) is largely responsible for back-porting the HDR-FOX CF to the Foxsat, and is certainly responsible for extending RS to the Foxsat, Raydon apparently having dropped out of the scene. If af123 had also dropped out for any reason (his enormous contribution is entirely voluntary, and circumstances and interests can shift), we wouldn't have what we have (although recently we have picked up a couple of guys who seem to have the skills to pick it up and run with it).
I suggest, if you have any leanings towards developing the Foxsat CF further, you start a conversation with MofTot who will be able to explain the differences and blind alleys. You must keep hardware limitations and architecture differences in mind, and Raydon might not have made all his source code publicly available.