RVDT,
you are not listening! They are not transposed between the 155 and the 135. The 135 has a 3 axis AP and the 155 has a 4 axis AP. When the 155 is flown with 3 axes engaged the PFD will mirrror that of the 135 i.e. the ALT will be on the right as it is controlled by the cyclic. When 4 axes are engaged it moves to the left as it then controlled by collective, and the IAS appears on the right as it is controlled by cyclic. Regardless of which axis is controlling the altitude, the means of adjusting it (or V/S or CRHT) is always the collective beep.
The S-92 does the same, except Sikorsky have put the cyclic axis on the left and the collective axis on the right, must be to replicate all those aircraft with the collective on the right and the cyclic on the left
