DON'T do this! Unless you know the exact pin-outs for both modules' expansion ports, you could be looking at an expensive, module-frying mistake! Consider: if the Cockpit or Hyrlo have any pins that send rail voltages (they're both powered modules), and they do so into an audio circuit, or do so in reversed polarity, or a few other potentially disastrous things, the resulting connection could literally blow up BOTH modules as well as doing potential damage to your power system and other modules in the process.
Only do this if both manufacturers say it's possible. But the best rule of thumb is to believe that anything going on BEHIND the panel aside of power and Eurorack-standard bus connections is going to be proprietary between manufacturers, and always presume that you can't expand Company A's module with one from Company B. Again, I'm sure there's exceptions...but find out what they are directly from the manufacturers AND find out if those connections might void your modules' warranties before even considering this.