That is to be expected.[br]
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The vibrancy is due to the screen being an LCD screen versus OLED that original Apple uses. While you can find very cheap LCD screens as cheap as $25 or so ($85 on iFixit with high quality and warranty [product|IF442-000]), an OLED screen will run you a ***minimum*** of about $100 for end users, and closer to $150 for higher grade ($145 on iFixit). If you spent less than that, no matter what the seller told you, you got an LCD screen (and possibly lied to if an untrustworthy vendor on Amazon or such).[br]
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The "not an Apple product" message is also to be expected. To avoid it, your original screen must be used to either copy the data from the serialized chip, or to microsolder and transfer that chip over to the new phone. This is also detailed on the repair guide featured here on iFixit: [guide|140593].