Well, there's still room for improvement for Google translate...
• So I'll make a wild guess based on my personal workflow with photos:
Maybe you first preview your photos in JPG (because it's fastest), and isolate several of them, either the "best of" you want to work with, or on the contrary the ones you want to delete.
Once you have finished your selection, you want this selection to be mirrored on your master photos (the DNG) so you can work with the raw files.
• If so, here's a way:
— Put XYplorer in dual pane {F10}
— In the first pane, open the folder that contains the JPG files
— In the second pane, open the foder that contains the DNG files
— In the first pane, select the JPG files you want
Then either:
a) Open the menu "
Pane|Sync Select..." > Choose the entry #7 "
Select Selected" and check the two boxes "
On both panes" and "
Ignore extensions" > Ok
or
b) paste the following line into the Adress Bar, then press {Enter}
::sync("SelectSelected" , , 1, , 1);
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As a side note, I may add that I don't use this RAW+JPG workflow anymore for a simple reason:

I'm using XYplorer preview with picture codecs, it's much faster to make preselections directly on the RAW files!
(Except for 16bit TIF which are painfully slow, but Canon RAW shouldn't give you any problem.)
• So no need to bother:
— Shooting in RAW+JPG
— Converting to DNG (best to avoid this if you can)
• Much better to:
— Shoot in RAW
— Preview RAW files in XYplorer, deleting the unwanted, and marking (e.g. with label) the favorites/priority
— Import those RAW in your editor of choice
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Hope this helps,
Flux