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The answer is a qualified yes.? Most circuits use top and bottom parts with vias as needed.

However, you need to consider that the two circuits are going to be less than 1/16 of an inch apart, and then consider crosstalk between the two circuits.? If you were doing a 4 layer board, the ground and power planes would tend to act like ground planes, and you'd have less problems.? You don't, though.

The PC board makers don't know, and don't care what you do.? All they care is if (according to their rules) they can manufacture the board.? Shorts?? Overlapping ground planes?? bad labels? reversed connectors?? They don't know, and frankly, they don't care. Cheating for the manufacturers is that the there are two different designs on the? same board, separate (I think) and not connected any way to each other.? (or, I bet, two designs separated by a snap off, if they can do that).

Since you don't use both sides, then I'd do a ground pour on both sides, and that of course, would weld both circuits together. It's the same thing as a construction variant, where you either install a part or not.? They won't care.

Now, if you have a small circuit board, say you can fit more than one on a 100 mm by 100 mm board, you can duplicate the pattern (in EAGLE, one way is to close the board, then copy and paste the board pattern).? Go completely across the board with lines on the milling layer, and you can have multiple designs (same design) on the same produced plate.

Got more LED strips to substitute for backlights than I care to think about.? LED (1206) and resistor (0805) on the other.? About nine LEDS on a side.? Length determined by the 100 mm cheapie limit.

Harvey