Question on Intercompany Project Contract

What will be the expected behavior for an intercompany contract, if we associate same project and tasks to both the contract lines Line 1 & 2 with two different bill sets i.e, Bill set 1 for Bill Plan 1  and Bill set 2 for Bill Plan 2 or Vice Versa i.e, Bill set 2 for Bill Plan 1 and Bill set 1 for Bill Plan 2. 

And how the invoices will be generated in both of these cases.