I have no idea what the difference is (if any) between lentils and split peas?

And I don't suppose there is any difference between different coloured lentils or split peas is there?

I was intending on making a curry tomorrow (found a great recipe for my cauli that I needed ideas for), and I have a bag of yellow split peas, and just wanted to make sure that it doesn't matter exactly what they are, iykwim.