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@Dutch_Cheese
Don't forget SpeedStream, Special (or Super?) Tourist, Magnum, Club Sport and Designer Select. Although the last one is no special sets but a mixture of other 531 sets.
Here are some specs.
http://steelrenaissance.blogspot.com/2009/07/reynolds-tubing-specs.html
http://fivenineclimber.com/bikes/gazelle/misc/reynolds_80.htm
Within the 531 group, the differences are basically the outer diameter, wall thickness and tube shape.
I think all the same material, treatment and manufacturing.
If it's another alloy, manufacturing process (e.g. welded tubing)