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(Source: Preferred method to specify system/version - in url address or parameter )
Specifying the version parameter in $translate
In the case of SNOMED, the system will as always be just http://snomed.info/sct The crucial factor is the location of the map. The edition of the source and target is not important, so the use of the version parameter is prohibited. eg url=http://snomed.info/sct/731000124108/version/20200301?fhir_cm=6011000124106
Ontoserver uses conceptMapVersion for this as well because concept maps that do not use a url in this way also need to be able to specify a version. The working group made the suggestion that the version parameter might be used if the conceptMapVersion is not specified.
(Source: $translate with version )