How can I accomplish this?

I am trying 2 parts follow a bezier curve path, but I want the second part not to overlap the first part, but I also want them to touch each other. Here is what I’m trying to accomplish:

Notice how the green part, and the red part are touching each other, but not overlapping each other. Is there any way I could get the t that the second part should be at in the bezier curve so that way it looks exactly like it looks in the picture above?

Edit: Oops, almost deleted my topic!

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Your post makes it seem as though you already have the code to give you the iterable positions of the curve? If so, just step it based on the size of the block.

I am confused with what you are trying to ask.