Difference by facts Difference ABH/AEC

Let's not even try to put together the differences ABH/AEC on the basis of facts. Maybe we'll get on with it. Samples of blocks were examined in terms of their composition and coating, and it was found that the cylinders were not coated with NIKASIL. What about the AEC? Are the cylinders there coated or made of a harder material? Could such an investigation be done with the piston rings of ABH and AEC? That would be interesting if there had changed something in the composition! How is the composition of PT/ABH/AEC blocks in the range of cylinders compared to each other etc.... is a difference in the thickness of piston ring packages, spring stronger, thickness of individual rings....