In a real world it'd be normal thing
When you have two broken identical devices, you would certainly use one as a source of spare parts - so i support the idea
In this way you would end up with one working item (if succesfully repaired with parts from the other) and another one broken/out of order or at least some spare parts (as if science skill were administered to disassemble item)
It is possible to assume that at identical things different details are damaged.It will make game more balanced in the plan and will allow to get rid of a considerable quantity of unnecessary things, it is better to have one useful than ten useless
Skill less than 100 % - the penalty of 50 %
Skill less than 200 % - the penalty of 25 %
Skill more than 200 % - the penalty of 0 %