Correlate requests on multiple frontends based on src (no replies)

Hi All,
It is possible to correlate requests from multiple frontends so can i
direct the request to one frontend to specific backend servers based on
the backend servers accessed by the same ip address on another frontend ?
To understand the scenario:
MySQL Master 1 < -> MySQL Master 2
| |
MySQL S1 MySQL S2
| |
MySQL S3 MySQL S4

In haproxy :
frontend1 points to MySQL Master 1 + MySQL Master 2
frontend2 points to MySQL S1-4

I want if possible to redirect clients accessing MySQL Master 1 on
frontend1 to be redirected to MySQL S1 + S3 when they access frontend2.


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Best regards,
Vintila Mihai Alexandru