With all due respect to Tyler Buchner, what these two have actually done on a collegiate football field as passers, is not similar.
Tyler Buchner, so far, has a career 57.6% comp pct. Card is 65.5%.
In 2022, Card had 5 games in which he threw 5 or more passes, was never below 63%. His 2022 comp pct. for those 5 games was 69%.
In 2022 Buch had 2 games in which he did. He was never above 60% comp pct. and the average of his 50 throws was 56%.
For Card, if you combine 2021 and 2022, it's 10 games of 5 or more passes with only 1 below 60%. The comp pct for those 10 games is 66%.
Tyler Buchner has literally never had a game in which he threw the ball 5 times or more and completed 60% of his passes. In games in which Buch has thrown the ball 5 times or more here are his pcts. 43%, 50%, 56%, and 56%.
At the present, Buch's floor as a passer is substantially less than Cards. While I think very highly of the Buchner, Card has more experience and proven much more capable of being an actual QB at this level.