There's no changelog issued by either Garmin or their 2 map data providers to even make comparison between versions of the same map possible, so even harder to compare maps from Sensis and HERE.
On the road in real time or simulation with a knowledge of the other's data or two units side by side with 2 different maps loaded is the only way afaik [but i don't need to drive myself even crazier, so over to you Shermmie ].
HERE gives some generic data of their own AU/NZ updates over the past 6 to 18 months though, but there's no way to view specifics or even check the overall statistics from one map version to the next:
Code:
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