Engineering Thermodynamics
In order that a cycle be reversible, following must be satisfied

When heat is being absorbed, temperature of hot source and working substance should be same
Free expansion or friction resisted expansion/compression process should not be encountered
When beat is being rejected, temperature of cold source and working substance should be same
All of these

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Engineering Thermodynamics
The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that

Heat is supplied to water at temperature below the maximum temperature of the cycle
Rankine cycle is hypothetical
A Rankine cycle receives heat at two places
Carnot cycle can't work with saturated steam

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