???
As Troy said, there's no "jump", the 7A is essentially just a 4AFE with longer stroke and was used in the AE92 beforehand as well. Not at all uncommon for a model of car to come out with several different engine capacities depending on spec, just look at 90s Civics which had 1.3, 1.5 and 1.6L models all at the same time in the EG series)
BTW though Troy, the 4AFE never had 85kw in Aus, it was more like 76-77kw (although some of the AE95 4WD wagons apparently came with the high-compression 4AFHE, but they would have been imports from Japan).