For the first question, there are visible differences between different generations of processors. Within a generation (i3 vs i5 vs i7), the processor usually has a model number, serial number, and date code silk screened onto the top of the processor. If that counts as a visible difference, then there is. However, the physical appearance and shape is the same throughout a processor line.
Regarding the second question, I have no idea what you're trying to ask.