Regarding UGA vs Bama's D. They run the "same defense" in a lot of ways, but in reality they don't do a lot of the same stuff. Some of that is due to personnel, some is due to playcalling (which may hindered/helped by personnel).
Here are some examples.
Bama vs. UT . It's 1st and 10. Bama has 2 defensive linemen in the game, plus Will Anderson lined up as defensive end to rush. Bama has 2 linebackers (not counting Anderson who isn't being used as an LB) and 6 DBs (i.e. a dime package). They are set up to defend the pass even though it's 1st and 10 and they could easily run it.
Tennessee is in shotgun with a RB next to the QB and 4 WRs split out wide.
Bama has Kool Aid on the line against a WR and Hellams 10 yards back on their best WR Hyatt.
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When the ball is snapped Bama rushes 3 and drops 8 into coverage. The Vols run a play action pass that the LBs don't really bite on. There is no pressure on Hooker because they have 5 guys blocking the 3 rushers. Hooker waits for Hyatt to get open and then throws a rainbow to a wide open receiver for a TD. Snap to release is 3.1 seconds.
Same sort of situation for UGA vs UT in their game.
UT lines up in almost exactly the same formation as the play above. It's 3rd and 6. It's a passing down.
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UGA, though, has a different defensive call. They have 3 actual defensive linemen in the game (300lb Jalen Carter, 320lb Nazir Stackhouse, and 265lb Mykel Williams) and a linebacker (250lb Chaz Chambliss) and then one LB spying the QB and dropping 6 into coverage. The result of the play is a sack/fumble/shouldabeenasafety. Contact between the defense and Hooker? Exactly 3.1 seconds
So why did the same play for Tennessee end in a TD vs Bama and end in disaster vs. UGA?
UGA has better defensive linemen and they pressured the QB better by taking advantage of better linemen but ALSO bringing more pressure. Bama had 8 in coverage and gave up a long TD while UGA only had 6 in coverage and got a sack.