1.Kc2-b2   2.Gd4-a1   3.Ga1-c3  
4.Gh3-b3   5.Gb3-b1   6.Kb2-a1  
7.Nf6-b4   8.Nb4-a2 Nf8-d7 #

b) bGd4-->a7

1.Kc2-b3   2.Gh3-a3   3.Ga7-a2  
4.Ga3-c3   5.Kb3-b2   6.Kb2-a1  
7.Nf6-d2   8.Nd2-b1 Nf8-d7 #

c) bNf6-->a7

1.Gh3-d7   2.Gd7-d3   3.Gd4-d2  
4.Gd3-b1   5.Kc2-b2   6.Gd2-a2  
7.Kb2-a1   8.Na7-c3 Nf8-d7 #

Three solutions in which in the final mate will be replaced on  thematic fields a2, b1 and c3 all three black pieces, unfortunately not cyclically.
Identical mates.