I have a Golden and a Cavalier also.
Mine can easily eat the same things. They often don’t because I’m always trying something different and have limited choices for my Golden because of his food intolerances.
That said, I do look out for a couple of things. Both breeds gain weight easily, so if you’re feeding a high calorie food, be sure to closely watch your Cavalier’s portions. Watch them both, of course, it’s just easier to overfeed when the portion is tiny to begin with. And, I prefer smaller kibble. I don’t care for large breed formulas that have large size kibble for my Golden and would never feed it to my Cavalier.
