I have a technical question more or less difficult, I drive an Audi V8 BJ92 model 93 with a 4.2l ABH engine, unfortunately I have engine damage (bars in the cylinder walls)

My father had driven an S6 4.2l AEC which suffered a head damage at 120tkm (Risse in the cylinder head)
At that time he got a replacement engine from Audi with 20% to pay the block we kept, which comes to me now too good, possibly!Now my question can I build the two engine block from the AEC and all the other parts of the ABH together? do not hit the pistons with any valves. Cylinder head gaskets are also 3 camshafts for both of them according to Audi order NR. just the outlet camshaft of cylinder head 5-8 is different. (sighs)
I also looked at both pistons, the ABH has valve pockets of the AEC only on the inlet side for the valves on the outlet and inlet side!
The cylinder heads are almost the same with the part number up to the final letters.
Who can continue to help me???

Would like to flood a few more cylinders for summer!
