Is Venus a good comparison to Earth with regard to the impact on the climate from atmospheric CO2?

There is no real comparison link

While it is true that the surface of Venus has a temperature around 860 deg. F., the fact is that Venus has over 220,000 times as much CO2 as Earth’s atmosphere!

Because Venus is perpetually cloud-covered, it actually absorbs less sunlight than the Earth, even though it is closer to the sun. Were it not for its extreme greenhouse effect, its surface temperature would actually average colder than the Earth.

The atmosphere of Mars and Venus comprise mostly of CO2, yet Mars is a cold planet, and Venus is a hot planet. The answer why temperatures are different is not the distance from the sun, but the density of the atmosphere. Thus CO2 is not responsible for temperatures in these two planets.