Question on Double Closing Contracts

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Hello Everyone, 

I'm attempting my first double closing in CA and was wondering about some details.

Can I use a generic Real Estate Purchase Agreement contract for the second closing even if I'm using a Real Estate Agent Contract for the first one?

If the first transaction is being done by an Escrow company, do they hold the funds for the second transaction? Or do I need to hire a real estate attorney?

I really appreciate your answers and any clarity on my next steps.

Thank you!