LabelService.Label vs AccountLabelService.AccountLabel

Hi Guys, 

I was reading up the guide on API objects and methods, and saw that IDs of labels are unique across the board. 

Label ID

Global

Yes

However, one thing that isn't clear to me is if this Label ID refers to both LabelService.Label and AccountLabelService.AccountLabel considering they are technically different entities, accessed in different ways through the API. Is it safe to assume that I can store both on a single table with only the ID as unique key? Or should I store them separately as a given Label may have the same ID as an AccountLabel? 

Thanks!

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