Can you use an iMac Pro 2019 with a 2013 non-retina display iMac as a second monitor
Can you use an iMac Pro 2018 with a 2013 non-retina display iMac as a second monitor?
iMac 27″, macOS 10.15
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There is no 2018 iMac Pro. The iMac Pro was released in 2017, and has not seen an update since.
You can use a 2013 iMac as a display for a 2017 iMac Pro. See here: Use your iMac as a display with target display mode - Apple Support
The resolution will be limited on the 2013 iMac however, as it cannot display the native 4K or 5K resolution of the 2017 iMac Pro.