Answer
No, SNMP support is not different among the Junos OS platforms. SNMP configuration, interaction, and behavior are the same on any Junos OS device. The only difference that might occur across platforms is MIB support.
You cannot provision or configure a device using SNMP on Junos OS.
For a list of standard SNMP MIBs that are supported on various devices running Junos OS, click Standard SNMP MIBs supported by Junos OS.
For more information, click Understanding SNMP implementation in Junos OS.