[asterisk-dev] How to rotate between Stable and Trunk versions

[Obelix]

I want to run a trunk version of Asterisk with the ability to switch back to a
stable version.

Because they will be running with the same .conf files and call management
database, I want to be able to switch between them just my running a simple
script - either by copying them to and from their storage locations or by the
use of file links, and changing some of the paths in asterisk.conf

Besides the bin and lib directories are there any other folders whose contents
need to be checked?

I don't expect to change any configuration files or scripts unless they contain
configuration options that are version specific.

Are there any such samples out there?