Hello Sany,
The CASM08Z assembler will handle all instructions common to both the HC08 and HCS08 devices. However, it does not assemble instructions that are unique to the HCS08. A CASM assembler to handle the HCS08 would need to be purchased from P&E - it is not a free download.
The S19 format should be the same for both types of device.
Regards,
Mac