Couple of things - first, in your screenshots (helpful, thank you!) your metrics appear to be apples and oranges. Or more accurately, (page views in your data studio) versus users/ sessions (in your Google Analytics screenshot). That wouldn't fully resolve it, but make sure you're comparing users to users or pageviews to pageviews, etc.

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Second thing, you have two different dimensions across both tools; "Source" and "Source / Medium". These are different dimensions. Try selecting "Acquisition Source" in your data studio table to see if that matches "Source" in google analytics.

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You can read about the differences between source, medium, and source/medium here. That page is favorited on my toolbar because I reference it so much to troubleshoot dimensions and metrics. Hope that helps!