I noticed a difference between numbers returned by visits metric in Analytic workspace and visits metric numbers from Data warehouse report (on hourly granularity)

From my understanding, it could be because of the following case-

If a user visits my website and their visit lasts for 2 hours, then in hourly granularity, visit would be attributed to both Hour1 and Hour2

Can anybody help me validate my assumption? Are there any other possible cases where numbers would show a difference?