I actually don't know if its possible , but it sounds kind of weird and I ve also never heard of anybody doing that.I guess that since the mk1's eyes are bigger , you'll have to find a way to fit the gaps..I've seen an MX5 looking like a Z3 though , so everything is possible!
Maybe you could just change the inside of the headlight(that contains the bulbs and the plastic around them) but not the crystallAt night , it'll look like an mk2..