the old url's and new urls are completely different lookign at that. you should however be able to sort out a 301 redirect match (assuming there is a structure to both old and new sites.
With regard googlebot accessing the old hosting, this is where the difference between the internet, and the world wide web naming system come into force. WE use domain names for the world wide web (WWW), which the DNS servers then translate into IP addresses on the internet. Googlebot on the other hand, spiders by IP adress and location . So while the DNS servers might be updated for the www locations, the IP adresses will still be in databases on datacentres across the network. because of this, googlebot will keep hitting both the old and the new servers.
If it hits your old IP and finds your site gone, you just lost some trust factor from google. So by leaving it at the old and new locations, you get a nice smooth transition with no loss of trust from Google.
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