Is the color hue of a variable in VS Code telling me something?

I have noticed a little curiosity in VS Code with a Python script I am writing:

I have some function that returns a numpy matrix B along with a list of parameters called parameters. In the editor, the blue hue of B is a slightly darker color than the one for parameters. This also happens for all caps variable names, like ABC, but not when starting with a capital letters and then switching to lowercase, or for a single character lowercase variable name like b.

Here are some screenshots:

Zooming in on this screenshot confirms that the colors are slightly different (”dark” blue is #44c1ff with a #1e59c5 shadow, while the lighter blue is #7cdcf0 with a #1e1ea7 shadow).

My question is: is VS Code trying to tell me something with this slight color discrepancy? Am I violating some variable naming guidelines unknowingly?

What I tried: Changed variable names around, got different color hues, code executes the same regardless of color.