“…[19] Introducing now two right quaternionic Hermitian structures h 1 and h 2 on the real space H R , coming from two admissible triples (g 1 , J 1 , ω 1 ) and (g 2 , J 2 , ω 2 ), we will show that sufficient condition for compatibility according with definition 4, is that the hypercomplex structures J 1 and J 2 are the same, up to a transformation of a right SU (2) …”