A reader who saw the last post on the 3-button keyfob used on Toyota Echo said that she has a Toyota keyless entry remote with the same FCC ID (HYQ12BBX) but with a different button configuration.
She is correct. In addition to the 3-button keyless remote with FCC ID HYQ12BBX, there are two 4-button Toyota keyfobs with the same FCC ID.
Link to Toyota keyless entry remotes with FCC ID HYQ12BBX.
All of these parts are user programmable.