I guess your SD Card has two partitions on it, a boot partition and the data partition. The easiest way is to use the balenaEtcher tool, I just have cloned my SD card this way on a Win10 laptop.
Please note: Never let windows make any changes on your SD cards !!!
Insert your original SD Card into an external SD Card Reader (USB).
Insert the new, target SD Card into the SD Card Slot on your windows machine
Ignore all windows filesystem messages, just click on no, no, and close :.)
Start the balenaEtcher Tool, select the source SD card and select BOTH partitions !
Select the target SD card, I cloned a 32GB card into a 64GB card, that works fine.
Start “Flash”
The balenaEtcher Tool will copy both partitions onto the new SD card, expand the filesystem and make the SD card bootable.
That takes a while.
When finished, insert the new SD card (the clone) into your PI4 and it should boot and start without problems.
Enjoy your new SD card and even a larger filesystem.
Keep the original SD card as backup for a while … you never know 
“Win32DiskImager” is not “SD Card Copier”