Is is possible to deny access from one network to another on localhost?

Hi, I have a host with 2 networks, there are 2 processes each bound to one of the networks. These processes should not be able to communicate with each other:

net A 10.10.10.10--> proc1

net B 10.10.20.10--->proc2

I was wondering if it would be possible to use the firewalld to drop connections from net A to net B and stop them from communicating with each other? or in this case these communication will not be routed through the firewall and something like namespaces should be used?

ps: i know its poor design, its not my idea.

Thanks in advance!