Our production server has been build to use 16k logical page size (ASE 15.03). For performance purposes I am building a 4k page server. My questions are:
* Can I dump a database from the 16k page server and load it to a 4k page server?
* Is it done as simple as dump and load, or I have to follow certain rules and what are they?

thanks in advance.

No can't use dump and load on different page sizes. Will have to copy data with bcp, etc.

Dump and load for different page size is not supported,u can copy data sing bcp or u can use sybmigrate utility.