A conditioned soul is forced to accept a particular type of body by the higher authority of material laws, but here (in SB 3.20.8) it is clearly said that the Lord was not forced to accept the form of a boar by the external power: Revision history
Diff selection: Mark the radio buttons of the revisions to compare and hit enter or the button at the bottom.
Legend: (cur) = difference with latest revision, (prev) = difference with preceding revision, m = minor edit.