edit - and the intake is going to be completely different. if you know ANYTHING at all about either car, you'd know that. the only thing that would be interchangeable between the two would be anything labeled "Universal" (like those muffler whistles - WOOT-WOOT!!)
The Miata and Capri share the same head and cylinder block. That's it. Outside of that, nothing is equally interchangable. This includes all intake, exhaust, and turbo (Capri XR2) components. They are two completely different cars that happen to share a similar engine family. As previously stated, the Capri is front-wheel-drive while the Miata is rear driven.