reading MIB v1 with v2c request

Hi, I'd like to know, if I can read mib v1 with the request version
v2c or even v3.

For example I'm able to read ifInOctets.1 like this
snmpget -v1 -c community 192.168.0.1 ifInOctets.1
the same as with
snmpget -v2c -c community 192.168.0.1 ifInOctets.1
so I'm able to read this with both the snmp v1 and v2c (it's for
example a cisco router supporting snmp v2c)

Is it rule due to the compatibility or is it only luck?
I was not able found anything pointing me out of this.

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