Clonezilla does a straight copy duplicating partition sizes by default. This means that if you copy from a small disk to a large disk, you will get the same partitions and their sizes of the small disk on the large disk with the additional space on the large disk as unallocated space.
If you are lucky and the smaller disk does not have another partition after the file space partition and what follows is just unallocated space, you could use a disk manager application to just make the file system partition larger and use up the unallocated space
This first option may require you to use two utilities, one to extend the file system partition into the unallocated space and the other to modify the file system so that the new space is available. For example with Ubuntu Linux when I ran into this problem, I had to use the parted utility to extend the file space partition and then the resizepart utility to properly resize the Linux file system.
However, Clonezilla has the option of doing a proportional copy. I used this option when I ran into the problem of same partition size when doing a disk to disk copy to a larger drive on a Windows 10 PC, in my case a 32 GB eMMc to a 128 GB SSD. My problem was that after the file space partition of some 30 GB there was a smaller 100 MB partition for recovery. So when I did the disk to disk copy and ran into this problem, I was not able to just extend the file space partition.
See this Clonezilla page, The advanced parameters for disk cloning
If the target disk size is larger than the source disk, you can try to
use option "-k1" which will create the partition table proportionally
in the target disk and turn on option "-r" to resize the file file
system in the partition automatically. This is useful to make use all
of the target disk size.
