Agree with all above comments. Old version of SEP clients are managable by 12.1.4.
I suggest you that you can upgrade your SEPM with 12.1.4023.4080 (RU4a) because there is a vulnerabilities which is fixed in 12.1.4 (RU4a)
See this
https://www-secure.symantec.com/connect/forums/symantec-endpoint-protection-manager-1214a-and-11074a-are-now-available
https://www-secure.symantec.com/connect/blogs/latest-symantec-endpoint-protection-released-1214a-and-11074a