Mimic access mask from one forum to another via DB command?

[SWFans.net]

Okay, here is a question for you DB gurus out there.

We are looking to add a new private forum, but after it is added, we don’t want to have to go through and edit the access masks of the over 400 users that already have access to the forum to whom we want it to have the same access list of.

Is it possible to run a MySQL DB query that would be conditional so that the access table entries for all the users in one forum would be set the same for this new forum?

Basically we want to mimic the access list of an already existing forum, and I don’t know enough about query structure and conditionals to be able to pull it off on my own.