Garmin doesn't make it easy to find out what JCV goes with what IMG, however once you know the sequence you can work it out. For instance, NA 2019.30 uses D3060280A.jcv so next version will use D3060290A.jcv. So the progression is by 10 in the file name for each map release. You can open the JCV file in [Only registered and activated users can see links. ] to see when it was made which will indicate it's relationship to a given map version without looking any deeper.

[Only registered and activated users can see links. ]

Here's the link to download D3153280A.jcv:
Spoiler:
[Only registered and activated users can see links. ]