What does it mean that Singular Values of two in principle unrelated matrices are really similar?

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I have two matrrices $Q_1$, $Q_2$ of size $5\times8$. They should not be related to each other, they just describe the 8 coefficients of 5 bivariate polynomials, that should also not be related, apart from the fact that these two sets of polynomials indirectly describe the same data.

When I perform the singular value decomposition of the matrices, it turns out that their singular values are pretty close to each other.

Does that mean something?

I just performed the SVD to play around with the things I had, but this coincidence is a bit strange.