Pro Tour Return to Ravnica
Willy Edel vs. David Ochoa
Willy Edel would have won the match 2-1 rather than Ochoa coming back and winning the match after starting 0-2.
Pedro Carvalho vs. Stanislave Cifka:
Shi Tian Lee vs. Eduardo Sajgalik
Kevin Chew vs. Yuuya Watanabe
Shi Tian Lee vs. Stanislave Cifka
Yuuya Watanabe vs. David Ochoa
This match would not have happened, but if it did under the new rules the same result would have occurred.
Overall Different Results: 1
Pro Tour Gatecrash
Ben Stark vs. Steven Mann
Joel Larsson vs, Gerry Thompson
Owen Turtenwald vs. Eric Froehlich
Melissa DeTora vs. Tom Martell
Eric Froehlich vs. Tom Martell
Joel Larsson vs. Ben Stark
Ben Stark would have won the match 2-1 and proceeded to the finals vs. Tom Martell. During the course of the PT, Ben Stark was 2-0 vs The Aristocrats (with one of those wins coming against Martell), so it's somewhat probable that with these rules in place the winner of this PT would have been Stark.
Overall different results: 1 (2 total)
Pro Tour Dragon's Maze
Craig Wescoe vs. Andrejs Prost
Wescoe, the eventual Pro Tour winner would have lost 2-1 to Andrejs. Andrejs instead would have played vs. Utter-Leyton's boros deck in the semis. During this T8 match, Utter-Leyton tweeted
"This quarterfinal between Prost and Wescoe is a huge sweat for me, don't think I can possibly win against Wescoe"
Utter-Leyton would possibly have a semifinals and finals match against Esper control, where he obviously felt confident about his chances.
Andrew Shrout vs. Josh Utter-Leyton
Rob Castellon vs. Dusty Ochoa
Makihito Mihara vs. Matej Zatlkaj
Matej would have won this game in 3, but this would have still left the semifinal match as an Esper mirror.
Dusty Ochoa vs. Makihito Mihara
Mihara would have won the match 2-1.
Josh Utter-Leyton vs. Craig Wescoe
Match would not have happened, but it would have the same result as Wescoe was up 2-1 at the end of game 3.
Overall different results: 3 (5 total)
Pro Tour Theros
Jeremy Dezani vs. Kamiel Cornelissen
Makihito Mihara vs. Paul Rietzl
Reitzl would have won (and Mihara would be 1-1 in terms of how he was affected by the changes)
Sam Black vs. Kentarou Yamamoto
Pieree Dagen vs. Guillaume Wafo-Tapa
Jeremy Dezani vs. Makihito Mihara
Sam Black vs. Pieree Dagen
Overall different results: 1 (6 total)
Biggest losers if the new system was used for the last year: Craig Wescoe, maybe Tom Martell
Biggest winners if the new system was used for the last year: Josh Utter-Leyton, maybe Ben Stark
tl;dr: 6 matches would have changed with one PT having a guaranteed different winner (as Wescoe would have lost in the quarters) and one having a likely different winner (as Ben Stark was favored against Martell's Aristocrats)