This is exactly right.
To expand:
The outer qualities of the consecrated bread and wine are called “accidents:” texture, smell, taste, and so on. These are accidentals, to put it another way.
However, the substance is different between regular bread and wine versus consecrated bread and wine, the Body and Blood of Christ. For convention’s sake we can still refer to the Body and Blood of Christ as “bread” and “wine.”
Say I take a normal potato and you eat it. It tastes like a potato should taste, and it smells like a potato should smell, and it has the texture of a potato. On a microscopic level, it is as a potato should be.
But now say I am a brilliant materials engineer and I can somehow “create” a “potato” out of something other than carbohydrates and water, and I can do it in such a way that you still perceive the taste, smell and texture of a potato. So when you eat it, your senses perceive a potato. But I just manufactured it in my laboratory and so you know that it is not a potato. But we can still, for convention’s sake, still call it a “potato.”