"data" to "curve" parameter issue

I have two Grasshopper definitions, that I want to connect.

Second of them, begins with "curve", and I can not change that parameter.

First of them, ends with "data" parameter. First definition selects particular lines in Rhino.

When I connect the "data" from the first definition, and "curve" from the second definition, I am not getting a satisfying result at the end of the second defintion.

I tried to take a look at what happens in this case, and here is what I get:

Now, as I said, the task of the first part of the definition is to select particular lines in Rhino. I tried to delete this first definition, and manually select all lines in Rhino (by doing the "Set multiple curves" on right click "curve" parameter)

In that case I got this:

But that is the whole point: I do not want to do this each time (manually select the lines), but instead of that I want first definition to do it for me.

For some reason this is not working, as "data" parameter is not giving the exactly the same type of data, as "curve" parameter would give in case I would select all the lines manually.

Any help please?