As many have observed, the stakes in the '86 comeback were much higher.
Another thing about the '86 comeback is that the teams had a week to dwell on it. The lead going into the second game was "only" 14 points, but few people (at least outside the Cat lockeroom) seemed to be giving the Cats much of a chance. Things looked even more dire as Toronto stepped out to a 15-3 lead in the first quarter of the second game, but ultimately the Cats shocked everybody.
Just as they would go on to shock all the people who wrote them off heading into the Grey Cup game against Edmonton that year (though many in Hamilton realized after the East final comeback that anything was possible).
And it was such a beautiful thing to see Edmonton's net offense at halftime of that Grey Cup game: -1 yard.
Mathematically, you could argue that Saturday's comeback was "bigger" than the '86 East Final series because the Cats overcame the deficit in less game time (less than 2 quarters on Saturday versus more than 3 quarters in '86). But I don't think there are very many football fans who would choose to evaluate comebacks in terms of "deficit divided by time remaining".
That '86 season also holds a special place for me, because I had only started paying close attention to the CFL one year prior, so the '86 theatrics occured for me at a very impressionable time.