We prove that two projective symplectic resolutions of <img src="/fulltext-image.asp?format=htmlnonpaginated&src=03V1X3183M278862_html\MediaObjects/s00209-005-0886-6flb1.gif" border="0" /> are connected by Mukai flops in codimension 2 for a finite sub-group G <Sp(2n). It is also shown that two projective symplectic resolutions of <img src="/fulltext-image.asp?format=htmlnonpaginated&src=03V1X3183M278862_html\MediaObjects/s00209-005-0886-6flb2.gif" border="0" /> are deformation equivalent.