If you're bored you can go to mycmp.fr and check their process catalog and compare a typical 55nm run to a 160nm run. Its not quite as standardized as ordering PCBs over the internet.
Different metallization (you usually don't get to choose Al or Cu) will have different resistances. Generally the smaller processes will be faster so a design with no race conditions or metastability problems on 160 might not run reliably or at all on 55. Some processes are analog oriented so they'll guarantee up to 60 volts or more, if you're trying to design power devices, other processes are logic oriented and they might have a standard voltage of 2.5, 1.1 etc.
You can design something that'll run on a 55nm process and something that'll give similar performance on a 160nm process BUT they'll be different designs. I think the closest analogy would be changing processes is like changing manufacturing material. You can make a car piston out of steel or aluminum but you can almost never just swap materials in an existing assembly line.
Different metallization (you usually don't get to choose Al or Cu) will have different resistances. Generally the smaller processes will be faster so a design with no race conditions or metastability problems on 160 might not run reliably or at all on 55. Some processes are analog oriented so they'll guarantee up to 60 volts or more, if you're trying to design power devices, other processes are logic oriented and they might have a standard voltage of 2.5, 1.1 etc.
You can design something that'll run on a 55nm process and something that'll give similar performance on a 160nm process BUT they'll be different designs. I think the closest analogy would be changing processes is like changing manufacturing material. You can make a car piston out of steel or aluminum but you can almost never just swap materials in an existing assembly line.