Have grand am changing motor the coil pack main plug is different can you switch packs with one off old look same but wires are in order?

No, you should not assume that just because two coil packs look the same and have the same number of wires that the internal wiring is compatible. Even if the wires appear to be in the same order, the internal circuitry and firing order might be different, leading to misfires, engine damage, or even a complete failure to start.

Different engine configurations require different coil pack arrangements to correctly fire the spark plugs in the proper sequence. Using an incompatible coil pack can cause significant problems.

Always use the coil pack specified for your new engine. The part number on the old and new engine's coil packs should match. If they don't, find the correct coil pack for your new engine. Checking a reputable parts supplier's website (like AutoZone, Advance Auto Parts, or a similar source) using your engine's year, make, and model will provide the correct part. Using the wrong part could be very costly in repairs down the line.