Migrating EX2 to ex4100


I own a EX2 with two 4TB drives in RAID 1 configuration. I just purchased an EX4100 and two additional 4TB drives. My plan is to convert to a RAID 5 configuration on the EX4100.

Can I just pop in the drives from EX2 + new drives and convert to a RAID 5 configuration? I’m concerned about losing data on the original disks, which hold important stuff.