I have two SP 2007 farms (APP + WFE + DB).
They are identical in terms of OS and SP build numbers. Every thing is same except of course they are using different machines names as they are part of same AD.
So farm 1 servers are called app1, wfe1 and db while farm 2 servers are called app2, wfe2, and db. Notice they are using same database sever although their config database names are different such as SharePoint_Config1 and SharePoint_Config2. So both farms share same database machine.
It is possible to use same content database for web application on those farms i.e. both web apps on those farms point to same content db?