The discussion at sexyloops shows just how challenging an ID of unmarked lines can be.
For practical purposes, the simplest approach will be to try them each on your favorite rod and see how they feel. If you're going to fish these inherited reels/lines, then you can just go with what feels best to you.
If you want to sell them, though, you're going to have a lot of trouble with a full, positive ID. Not only is the weight relevant, but the taper is as well. (You can probably figure out the difference between sinking and floating easily, though.) HPH