SFIHCM is used for the talent integration ie without Employee Central
PA SE IN is used for integration with Employee central and it follows SF release schedule ie every 6 months we release new SP level for it as it applies on ECC or S4.
PA SE IN would be replaced ECS4HCM
https://me.sap.com/notes/3244367/E
Important information when upgrading from PA_SE_IN to ECS4HCM
Check your scenarios being used
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