Yeah. Make sure you configure the element in the PopulateCache policy. When it’s configured with a value of Global, the cache key can be looked up from other API proxies that exist in the same environment.
Check out the element in the following docs references for PopulateCache and LookupCache policies:
http://apigee.com/docs/api-services/content/populate-cache-policy#element_reference
http://apigee.com/docs/api-services/content/lookup-cache-policy#element_reference