No but they should have some sort of element that ties them together. Like same filament bulbs, or same glass droplets or same colour.

Have a look at lode international catalogue for heritage style wall lights. http://www.lightinginspirations.com.au Something like the 'cosmopolitan' wall bracket with a different shade to the one pictured in the catalogue. Schots emporium/home of lightsr/restorationonline are several stockist I know of who could give you a price.

Hi there, there's a great forum on Houzz called the garden web which is more relevant to your question – feel free to post your design dilemma here.

The only way to tell is to look at samples of each material adjacent to each other in the location of your new kitchen. There are too many variables with lighting, photography, and screen adjustment to provide a valid opinion online. Your benchtop will be there for a long time so pay the extra dollars if you love the most expensive one and it works well with the other materials, otherwise you will be reminded of your compromise everytime you use your kitchen. Best of luck, Dr Retro House Calls