If you want shares in the company to reflect the hash values of the shares in Saturn and Jupiter then you need to do the following:

Every Saturn share gets 11 shares in the new company.
Every Jupiter share gets 12 shares in the new company.
Each new share gets an equal dividend.

Just in case you think this does not reflect the hash/share values you can test it.

Lets say Mr Pink has 156 shares in Saturn and Mr Blue has 143 shares in Jupiter. This means that both of them are generating 400Gh/s. In the new company Mr Pink would have 156*11 or 1716 shares. Mr Blue would have 143*12 or 1716 shares. Both of them would get exactly the same payout for the same hash generation.

No matter what scheme is chosen for share allocation, under no circumstances should anybody lose their income if the machine they have a share in breaks down. The whole idea behind a company is shared costs, shared risk and shared reward.

edit: The reason you should not lose you income is because you will no longer have a share in an individual machine. Instead you will have a share is a group of machines.