Yes it does. However, there might be other aspects why manufacturer has certified use of their device only certain way, or just simply regulated by the stamped IEC61008-1 standard. E.g. in this one the protective circuitry + test button are de-energized when the RCD is switched off (e.g. if used as a switch). Another factor could have been that circuit's capability to disconnect (at the extreme case when everything has gone wrong) might depend on which way it is connected.
When manufacturer has specified that a unit can be used both ways I have noticed that markings 1/2, 3/4, 5/6, 7/8 on supply side and respectively 2/1, 4/3, 6/5, 8/7 on load side have been used.
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