They are indeed different people... here is another (could this be the one? the spelling seems correct now): Kircher, Athanasius. Letter to Kinner von Löwenthurm, Godefrid Alois, 7 August 1661, Published in G. Schott, Organum mathematicum, Würzburg, 1668, pp. 57-64. Notes: Cit. Fletcher, AK und..., p. 158.