No. The difference is that PHYSICAL TANGIBLE things exist in the "analog" realm have infinite possibilities. Things that exist in the digital realm have a finite number of possibilities, and if you limit yourself to a particular subset of things you can even possibly do (such as those things which are implemented in computer programming languages), the odds go up greatly. If I tell someone to build a table leg on a lathe, there would probably be many variations between skilled builders. If I tell someone to make an efficient file store (or in patent speak "digital storage"), lots of people would probably come up with something similar...but that's patented: http://www.google.com/patents?q=digital+storage&btnG=Sea...
1. The length can be infinitely long, therefore the number of possibilities can be infinitely long.
2. For all practical purposes the space is so large it is infinite. How many possible permutations of 1s and 0s can you get in a 1024 KB program. Many.
3. If we go into the more practical example you raised I doubt there is much difference between the variance in resulting table legs and digital storage applications. If anything, I would say there would be more variation in the software, simply because the high cost of iteration and experimentation (and stricter physical constraints) have narrowed the design space of table legs, in a way which is much less apparent in software.