Note that the rubber feet are different:

The rear foot is thicker, with a deeper recess.

The front foot is thinner, with a shallower recess.

During reassembly:

If you're reusing the rubber feet, the leftover adhesive should be tacky enough to reuse.

If the leftover adhesive isn't sticky enough or your replacement feet didn't come with adhesive, you can use double-sided tape such as Tesa Tape to secure the feet.

Make sure the strips of tape aren't wider than 6 mm, otherwise they may not fit.

To install a foot, remove its adhesive liner, lay the foot into its matching recess, and press down firmly along the entire length of the foot to secure it.