Help connect points by id with line

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Hello, I have two cubes with 100 scattered points on each. I turned each ones point ids into an attribute called @matchingnumbers so that when I merged them they could be connected by matching the values.
This didn't work so then I tried grouping by start and end points.
However I couldn't get a line between id numbers or start and end points. The closest I got was with the connect adjacent pieces however they met at a central point and ignored the spaced position of the points.
I tried add node, I tried prim num vex and I even tried shortest path which errored and then said it was doing it however I tried all the parameters but refused to do anything.

That context is just to say that I have tried these things but I'm perhaps missing the obvious.
So my question is:

How do I connect lines between two identical boxes with the same scattered points at different sizes so that I can acheive non intersecting lines?
My goal with these lines is to do a rotating slime simulation.
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in the add node go to the polygon tab > by group > add by attribute then add your "matchingnumbers" attribute without the @
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