While technically very incorrect, if you are not trained in computer science and only focus on the human element of writing code, the two could be interchangeable. When people say "learn to code" they generally mean writing source code.

Humans speak English (the only language that matters of course). Computers speak Japanese (binary). Humans write in English and have it translated (compiled) into Japanese. The English is the source code. The Japanese is the filthy derivative code nobody cares about except the Japanese (computer).

When you run a program on your computer you generally only have access to the Japanese version. Fuck trying to translate that shit backwards.