The XPSAP is quite an ancient model that was initially replaced by the XPSAR.
For a comparison between them please check please check the attached file "XPSAP to XPSAR.pdf"

The XPSAR is now obsolete as well and was replaced by XPSUAF + XPSUEP.
For a comparison between them please check please check the attached file "XPSAR to XPSUAF.pdf"

Although most applications will allow the use the XPSUAF with minor wiring changes there might be situations where the application will have to be changed/adapted to incorporate the new safety relay.