Robots.txt http://example.com vs.http:// www.example.com

Question

I have a situation where we have two code bases that need to stay intact..

example: http://example.com.

And a new site http://www.example.com.

The old site (no WWW) supports some legacy code and has the rule:

User-agent: *
Disallow: /

But in the new version (with WWW) there is no robots.txt.

Is Google looking to the old (no WWW) robots.txt file as its rule? And will adding

User-agent: *
Allow: /

to the (WWW) side override this?

Changing robots.txt on in the old codebase is not an option at this time.

Answer 1

No, the subdomain "www." and the subdomain "" are separate subdomains, and the robots.txt from one of them is not used for the other.