The whole dashes are interchangeable. I have done so in my Ke30 2 door, you need whole dash and a support that runs from one side to the other (with bends.) Not sure on wiring loom changes, but you should keep the same gauge cluster that you have. I changed my wiring but i changed the whole thing from front to back. I had problems with jap tank and aussie cluster, jap cluster and aussie temp sender (big pain in arse.)
So my conclusion, keep same cluster, change dash (if you like,) but grab the whole thing including supports.