Hi nmk,
Sorry, I misunderstood your needs.
In the Dynamics 365, there are two type of SLA: standard SLA and enhanced SLA. The biggest difference between them is the following two:
- Standard SLAs can only be created for the Case entity.
- Only enhanced SLAs support pause and resume.
This is the options of the Resolve by SLA status field of the Case entity:

This is the options of the Status field of the SLA KPI Instance entity:

We can see that only the Status field of the SLA KPI Instance entity has the Pauses option. So the difference is:
- Resolve by SLA status field of the Case entity can only be used for standard SLA.
- Status field of the SLA KPI Instance entity can be used for both standard and enhanced SLA.
For Standard vs. Enhanced SLAs, you could refer to this article:
[View:https://docs.microsoft.com/en-us/dynamics365/customer-engagement/customer-service/define-service-level-agreements:320:50]