What is main difference error 404 &503?

A 404 error is an HTTP status code that means that the page you were trying to reach on a website couldn't be found on their server. The 404 Not Found error might appear for several reasons even though no real issue exists, so sometimes a simple refresh will often load the page you were looking for. The most common method is to retry the web page by pressing F5, clicking the refresh/reload button, or trying the URL from the address bar again.

The 503 Service Unavailable error is an HTTP status code that means the web site's server is simply not available right now.
 
Both are server issues.
404 Error is an HTTP Response Status Code which means ‘The resource at the requested location could not be found.
503 error Service Unavailable is an HTTP Status code that means the web site's server is simply not available right now.
 
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