Cable for MacBook Air 2020

Depending on IF your 'MacBook Air 2020' is an "Intel-based" model. Or similar year M1 model.

But for the most part, the included charge cable would likely be near alike. From tech specs

for each of these two models; M1 Apple silicon, and Intel-based MacBook Air 2020:

MacBook Air (M1 2020) - Technical Specs

Model Identifier: MacBookAir10,1

Tech Specs: MacBook Air (M1, 2020)

(M1) In the Box 

Both models show same short list of included items:

• MacBook Air
• 30W USB-C Power Adapter
• USB-C Charge Cable (2 m)

MacBook Air (Retina, 13-inch, 2020) -Intel-based Mac

Model Identifier: MacBookAir9,1

Tech Specs: MacBook Air (Retina, 13-inch, 2020)

• Identify your MacBook Air model - Apple Support

https://support.apple.com/en-us/HT201862

..An Apple source would find these included accessories identical..

However as 'volunteer helper' without either to check, I haven't a clue.