FW has got multiple ranges, the bigger one seems to be from the Home and Business range supporting High Voltage storage (https://www.freedomwon.co.za/lite-home-and-business-hv-range/), where the smaller one seems to be from the 52V Home and Business range (https://www.freedomwon.co.za/lite-home-and-business-52v-range/).
Other than for aesthetics reasons, I would also like to know why your installer chose the two different ranges. Were they identically priced?
Beautiful batteries are they, Freedom Won!