To be fair, generally Australians wouldn't have the same emotional proximity to bomb blasts in Sri Lanka by islamists as we would the same events in New Zealand. The attacks in Sri Lanka are emotionally remote.
Political rhetoric as a mannered response is another thing.
Normally you would be correct. This attack is a little different because of the similarities of link in the minds of many to the Christchurch attack.
Both involved the killing of innocent people observing their faith in a place of worship. There are reports of ISIS supporters (this may not mean much but further leaves a connection between the two events in the minds of readers) online claiming the attack is revenge for Christchurch.
These links are likely to have many comparing the two attacks and examining the reactions to both.
Add in the fact that it occurred on Easter Sunday at churches(as well as elsewhere) and many more in Australia are likely to feel a closer connection to it.
When put in this context the reading of the room by entities like the AFL, news organisations, politicians etc can leave a bit to be desired.