How to control system with 2 condersors+evaporators and 1 blower
This is an unusual setup, it would help to know more about what you're trying to accomplish.

There are a few scenarios that I can imagine:


You've mis-wired something
Your thermostats have the Blower and Cool terminals connected together. -- In this scenario, when either Thermostat energizes the compressor and blower, then other compressor would also be energized through this shared connection.   You could use relays to isolate the blower (the thermostat energizes the relay, which in turn energizes the blower).  This doesn't seem likely, as that would preclude the use of a fan-only setting.
If your aim is to create a 2-stage system, where the second compressor kicks in if the first one isn't providing adequate cooling, you may be able to connect the power on the second thermostat to the compressor lead from the first thermostat, this would engage the second compressor only if the first is already engaged AND the second thermostat is calling for cool; in this case, the second thermostat would not need a connection to the blower as it would already be on from the first thermostat's call.