Article: https://dustrunnersauto.com/honda-k20...

The most notable differences are the fuel system, camshafts, turbocharger, pistons, and tuning. To put it simply, the K20C1 is stronger and capable of producing more power than the K20C4.

I wouldn't call them the "exact" same engine as many people and publications have in the past, however, they're extremely similar and I think it's safe to say that they're about 90% the same or more.

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