G-RAID Thunderbolt 3 AC Power different regions

Based in Australia looking to purchase new GRAID Thunderbolt 3 drives. US price is significantly cheaper than here in Australia. Is voltage something to consider if I want to use a US purchases G-RAID for use in Australia or is the internal power exactly the same regardless of where’s you buy it?
Is there a specific model of power unit/plug I need to buy for Australian use based on the ‘19v 4.74a adapter’?
Also finally, if units are identical regardless of region is literally the only difference the product warranty? In which case would using a US purchases GRaid in a different region void the warranty?
Thank you in advance for your help and answers.