There's a good reason why it sounds wrong, because it is.

Antimatter is the same as matter, except its charges are flipped. That means that in a magnetic or electric field they might behave differently than normal matter, but not because different laws apply to them. It's because antimatter is different from normal matter, so under the same laws of physics, they behave differently. Similar to how a pebble and the Earth, under the same law of gravitation, experience different strengths of gravitational force.

Furthermore, except for charge, antimatter and matter are exactly identical. So when charge doesn't matter, they act identically. When charge does matter, they act oppositely but with the same magnitude.