Is exchanging two different things of different prices, riba (interest)?

I watched a video (I can't remember where I watched it) that says exchanging two different things of different prices is riba (interest) as per Islam, and it was told by the Prophet (Peace be upon him). I'll give some examples. 1. I give two $500 worth of phones to my friend and gain a laptop that is worth $1000. 2. I give two $500 worth of phones to my friend and gain a laptop that is worth $1500. 3. I create a mobile app worth $1000 and get a $1000 worth of laptop. 4. I create a mobile app worth $1200 and get a $1000 worth of laptop. How and when will these scenarios come under riba (interest) or not?