Exchange 2007 Standard Database Move

We have an Exchange 2007 Standard installation running on Server 2003 R2 which is running like an absolute bag of cr**, therefore I have built a new Exchange 2007 Standard installation on Server 2008 R2 and given it the resources it needs, everything is up and running and I can move users manually from old databases to the new databases on new server without issue, it's just that the time it's taking is too long for the amount of mailboxes we have.

My question is, if I choose to move the entire database as a whole rather than individual mailboxes, do the naming conventions for the new storage groups and databases have to match the old naming conventions?

For example:-

Old Config

Storage Group 1 > Mailbox_Database 1.edb

New Config

First Storage Group > Mailbox Database.edb

Is this OK?

The databases are huge in size, around 250 GB, hence the reason I'm carrying out this entire process as I'll eventually spread the load more efficiently. I'm also aware of the default limits set @ 250 GB for the database to dismount, I can get around that with a registry change temporarily.