No, they are two different smartphones that have some things in common apart from their name. They are both powered by the same processor, have the same battery technology (though the S20 FE has a 500 mAh more battery), and run on the same OS. Other than that, they have discrepancies in every other major part. For example, they use different camera set up though arranged in the same manner in a similar design. They have different screen sizes and different display technology (which is better on the S20 than the S20 FE). Both the front and back of the S20 are protected by Gorilla Glass 6. The S20 FE on the other hand has a Gorilla Glass 5 protecting its display but the back is plastic.