Targum Jonathan on Leviticus
He shall not alter it nor change it, that which is perfect for that which hath blemish, or that in which there is blemish for the perfect: but if by changing he will exchange animal for animal, both that and the one that is changed shall be consecrate.
Targum Jerusalem
And he shall not change it, good for bad, or bad for good: but if changing he will exchange animal for animal, both that and his changed one shall be sacred.