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What are the differences between an S811+ and an S811?

Physical differences include an improved printed circuit board, the change to the communications port from a
connector to a screw terminal set, and different front plastic housing. The S811+ includes a DIM with slightly different
firmware. The DIMs from the S811+ may be exchanged with an S811, but some functionality will be lost. The S811+ retains
the removable locking control terminal block. Firmware changes include enhancements to the existing protective features, additional protective features, a fault queue, programmable control terminal inputs, and auxiliary contacts. The S811+ also has built-in Modbus and QCPort communication capabilities.
What are the similarities between the S811+ and the S811?