Replication Server is independent of ASE versions, what that means is you can replicate between same or different ASE versions.
Having said that don't try out primitive releases of Sybase SQL Server to replicate to ASE 12.0/12.5 with Replication 12.1 and above.
Replication Server, also supports homogeneous or heteregenous data sources in combination with Sybase Enterprise Data Connect. So in a sense, replication can happen between 2 Oracle 8.0.x using Sybase Rep Server.
I am using Sybase Adaptive Server 11.9.2 for Linux OS. What is the procedure for Replication using the Same Kind of Server both as source and Destination. Could somebody who has already found out the solution for this give me a documentation of what i should do ?