Donnchadh Ó Laoghaire (Cork South Central, Sinn Fein) | Oireachtas source

I want to understand better the point that was made by Professor Mee and Deputy O'Callaghan. They were discussing the fact that aiding and abetting is not included. The LRC and Deputy O'Callaghan seemed to understand that somebody taking part in a conspiracy to murder could be charged with murder but Professor Mee seemed to have a contrary view. What is the distinction between aiding and abetting and conspiracy? Are they one and the same?