When you enter information about your home under each Form 8829 to depreciate your home office space, you are specifying only that particular home office space to be depreciated. Therefore, you will need to enter an Asset under each separate Form 8829 to depreciate the home office for each Schedule C.
Logically, each Schedule C is using a different space in your home as the home office, otherwise, the office is not exclusive to the business (which is required to be a qualified home office). It cannot be shared space (or if it is shared, it must be divided between the two businesses so there is no overlap).
As you are entering the information for each home office, the date placed in service is tied to each separate business as well. The same date will not be entered for both Form 8829s.
To learn more about claiming home office space for multiple businesses, see the following TurboTax help article:
Can I claim the home office deduction for two or more businesses?
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