COVID-19 in Orange County per The New York Times

Here is a chart for number of cases in Orange County from The New York Times on Google. It looks somewhat different than the data shown by the Orange County Department of Health. I zoomed in to show May to July.

I think both are showing a downward trend in the past few weeks but the data points seem completely different. Yet, both websites show the exact same number of cumulative confirmed cases as 34,646. How can the totals be the same when individual days are totally off? For example, I’ll pick a random date of July 15, 2020. OC Department of Health shows 555 cases, while NYT shows 911. That’s a huge difference. Who is right and why is the other source so different?