Here are the UK figures for Cheerios multigrain and Quakers rolled oats. Cheerios have 17x the sugar. I think they used to be worse in the past before UK sugar regulations led to lots of changes to breakfast cereals.

I use 100g because they have different servings amounts. In the UK, the serving size is just 30g not 39g.

I would note that reducing such foods to tables can miss the point. They make me feel very different to eat. One is a very moreish sugary frankenfood that makes me lose control of my appetite. I can eat it by the box. The other is something that makes me feel good but if I make too much, I'm done and can't finish it. Eating an excess is physically hard.

                   +---------+----------+
                   | Oatmeal | Cheerios |
    +--------------+---------+----------+
    | Serving size |    100g |     100g |
    +--------------+---------+----------+
    |     Calories |    374  |      378 |
    +--------------+---------+----------+
    |          Fat |     8g  |     4.8g |
    +--------------+---------+----------+
    | Carbohydrate |    60g  |    69.1g |
    +--------------+---------+----------+
    |     (sugar)  |   1.1g  |    17.7g |
    +--------------+---------+----------+
    |     (fiber)  |     9g  |     9.6g |
    +--------------+---------+----------+
    |      Protein |    11g  |     9.9g |
    +--------------+---------+----------+