Go to the HeinrichsWeikamp website, it will tell you.
I have already put that question to HeinrichsWeikamp:
Question - It's possible connect the external converter to the two Inon's with one Dual Sync Cord and still working very well?
Answer from HeinrichsWeikamp - Two identical strobes is the best combination you can choose.
And to INON also:
Answer from Inon - As you can see in our English instruction manual, we do not guarantee
proper functioning of Z-240 when using Sea&Sea Dual Sync Cord or any other cord
besides "Sea&Sea Sync Cord N". In some case, a dual cord divides electrical signal
from a camera causing insufficient electrical signal to trigger external strobe.
Now you can understand as I put the question to the forum for try find an answer from somebody with experience in use of the same configuration.
Best regards,
Tigershark