Which are the MX-5 B6 engine camshaft specifications?

I repair my car (mx5 mk1 B6 engine 1992) recently by swapping the cylinder head with another used one. After the operation, the car won’t run. Tries to start a combustion while you crank but stops and doesn’t continue in order for the engine to pick up some revs.

The new cylinder head comes from a mk2 B6 engine and on the head has a code of B660, I can’t find any info for this head on the internet.

However the only reason I can think of, that will cause the engine not to run after that is something different about the cam’s that new head wears.

I did check spark plugs – coil pack – leads – valve timing and all look normal.

So, does anyone know whether all 1.6 B6 engines wear the same cams?