The Universe is expanding, so it will have changed since the dinosaurs lived, yes. We know it is expanding because when something that shines is moving away very fast, the light waves coming from it get stretched out and the light looks redder. If we look at other galaxies and measure how red they look, we can tell how fast they are moving. The furthest galaxies are moving the fastest, so they look the reddest. That’s how we know the Universe is expanding.
Also, interestingly, our sun was in a different part of our galaxy, the Milky Way, when dinosaurs lived. This is because the sun is also rotating around the center of our galaxy, so now, after many millions of years have passed, the sun is in a different place than it was before.
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