To be more precise about the headline term – different SSDs in this case – means different SSDs based on using different SSD's internal architecture or subsystems like:
SSD built-in cache
SSD cell technologies
and not about the same SSDs with different capacities only...
What I have: 3 x 6TB SHR Volume with 12 TB redundant storage (1 disk recently broken)
What I want: 2 x 18TB SHR volume with 18 TB redundant storage (I'll expand the volume after the migration)
Of course, I want to keep my volume and migrate everything, to avoid any additional work and downtime...