Yes indeed, I imagine OP would prefer to purchase products matching those already fitted and therefore a nibble out of both patresses will suffice, as will drilling a hole as discussed.
Personally I'd drill with a step drill as they make a lovely clean and acurate hole in patress material and the next size cut creates an excellent de-burred finish, in my opinion no further action is required if the 2 boxes are butted tight together
However other contributors may say: "Such a thing could probably be used to make a hole of some size or other. I certainly would not use one for any purpose ever. A 20mm holesaw would be a more usual choice to make a 20mm hole."
In that case for simplicity it may be better to go back to plan A and add the additional socket above or below, with a gap about the size of a socket, using a short length of couduit or trunking. Or possibly a 3rd patress with a blanking plate.
In that case for simplicity it may be better to go back to plan A and add the additional socket above or below, with a gap about the size of a socket, using a short length of couduit or trunking. Or possibly a 3rd patress with a blanking plate.
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