ANZ goMoney and ASB Virtual use a 3rd party SDK to implement wallet functionality (most likely the Bell ID SDK). In the case of the ANZ goMoney, they support just 37 android devices - most likely the devices that are sold by the carriers in NZ. ANZ goMoney doesn't support the Google Pixel phone yet.
For Android Pay, Google tests and qualifies every Android 4.4+ device, which means there are thousands of devices already compatible. Android Pay is also in Chrome v53, so for those shopping websites that use the new JS PaymentRequest API, you'll be able to securely purchase things online without entering credit card numbers, and no worries about your card details being stolen.