Newton's third law, states that 'To every action there is always an equal and opposite reaction: or the forces of two bodies on each other are always equal and are directed in opposite directions", which is an assertion of the symmetry of interaction.
In principle, Changing any one of Newton's Laws does not necessarily 'contradict' the other two laws, since they are independent postulates - there is no necessity of logic which links them all.
See: Logical connection of Newton's Third Law to the first two
However, one must be careful when changing a 'fundamental law' as any of Newton's laws, since they are so intimately intertwined. Newton's three laws of motion generally go 'hand-in-hand' and are fundamentally taken as premises in any argument about the interaction of matter in classical mechanics.
For an interesting discussion of the nature and implications of Newton's 3rd law, see: Deriving Newton's Third Law from homogeneity of Space
and at: Violation of Newton's 3rd law and momentum conservation