Is Android 4.3 the same as 4.0.3? I came across a Google play app that says version 4.0.3 and up required and I have 4.1.  So do I have to upgrade because I rather not as my old apps ptobably will not work with 4.3.  My question is whether it's a typo and they meant to say 4.3 or is my OS 4.1 good enough?

Phone: S3
Here, you can see the versions: Wikipedia about Android
4.0.x is older than 4.1.x and so on. It's explained here