yep hydralic tappet heads only have 4 cam caps, there's an oil squirter there instead.
You might find the head is from a digifant car as caddyrage says, which means your old k-jet injectors wont fit. Easily solved though, simply unscrew the injector inserts from your old head, and screw them into the new one

You may have to swap things like coolant fnanges over as well if the new head has them.