The thickness is not an issue, The important difference is the "vents" that aid in hot starting. Note that these vents are above the throttle plates, so do not add a vacuum leak.
Some may disagree, but this was an engineering change somewhere before 1963. I use the vented gaskets in all the restorations I do. I have six NOS Pontiac Tri-Power carbs that have never been apart. They all have the vented gaskets.
Definitely, use the vented gaskets.
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'64 GTO Tripower Hardtop (Wife's Car)
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'99 Bonneville SE Sedan
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