D2R:PE Collection vs Upgrade and ability to Gift the D3 copy

I am thinking of purchasing the D2R the Prime Evil Collection, but I was wondering since I already own the D3 copy that comes with it if I had the ability to gift the D3 copy to a friend? Or should I just buy the Prime Evil update to get the D3 items because there is no ability to transfer the code from my “2nd” D3 copy. I am a bit confused on this.