As this question is asked often, here is the information FAQ on thermal pad sizes. 

Pinned to be easier to find 

FAQ # 59822  What are the thermal pad sizes for my 20 or 30 series graphics card?

Is the rtx 3080 ftw thermal pad sizes the same as the rtx 3080 ftw3 variant?

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Is the rtx 3080 ftw thermal pad sizes the same as the rtx 3080 ftw3 variant?

I would think so but you can contact EVGA tech support for verification. 

You can also replace the strock thermal pads with Thermal Putty. There are several good ones out there like Upsiren UTP-8, Fehonda LTP-81, Laird T-Putty 607, Halnziye HY236/HY256, CX-H1300. You often get better core contact since the putty is much softer than traditional pads. Also does a better job of cooling GDDR6X.