Do these Macbooks have dedicated or shared graphics memory?
Do either of these Macbooks (13860122 or MVVK2LL/A) have a dedicated or shared graphics memory?
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The order numbers like you posted vary with region and are very hard to research. However, I believe this is a 16-inch 2019 2.3ghz model. These are Apple's tech specs for that model in general:
https://support.apple.com/kb/SP809?viewlocale=en_US&locale=en_US
and indicate it has dual graphics, both discrete and shared.