Dead water pump, bent valves

[monkeh]

Hi all, Asking for someone who I stepped in to help keep another d24 940 on the road.
His water pump bearings collapsed, killing the tension on the timing belt and now bent valves.
I have a spare head I am willing to part with, with solid tappets.
His is hydraulic tappets.
Can this head be swapped like for like? Whats interchangeable on hydraulic/solid tappet heads?