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You can. Only thing is that each time you will copy PS will make a new layer. So if you want 2 layers to be there then:

Copy one "pattern" 3 times, align them how you need then merge down them to 1 layer. Same with other "pattern".

But if each are is his own color (1 cmyk chanell?) then there isn't actual need to making only 2 chanells of course.

Final pdf's or postcript's separation still be what you need (but that just only if those colors contains separete chanell colors).

Any way at end defenitly check it by looking on each color chanell.