El Niño and La Niña are both climate patterns associated with changes in sea surface temperatures in the central and eastern Pacific Ocean. They both have significant impacts on weather patterns around the globe.

Here's what they have in common:

* They are opposite phases of the same climate cycle: They are part of a larger climate pattern called the El Niño-Southern Oscillation (ENSO). ENSO refers to the cyclical variation in sea surface temperatures and atmospheric pressure over the tropical Pacific Ocean.

* They involve changes in sea surface temperatures: El Niño is characterized by warmer-than-average sea surface temperatures in the central and eastern Pacific Ocean, while La Niña is characterized by colder-than-average sea surface temperatures in the same region.

* They influence global weather patterns: Both El Niño and La Niña can cause significant shifts in weather patterns across the globe, including changes in precipitation, temperature, and wind patterns.

Here's a table summarizing the key similarities and differences between El Niño and La Niña:

| Feature | El Niño | La Niña |

|---|---|---|

| Sea surface temperatures | Warmer than average | Colder than average |

| Atmospheric pressure | Lower pressure in eastern Pacific | Higher pressure in eastern Pacific |

| Trade winds | Weakened | Strengthened |

| Rainfall | Increased in eastern Pacific, decreased in western Pacific | Decreased in eastern Pacific, increased in western Pacific |

| Impacts | Drought in Australia, heavy rainfall in South America, stronger hurricanes in the Atlantic | Flooding in Australia, drought in South America, weaker hurricanes in the Atlantic |

Although they have some similarities, it's important to remember that El Niño and La Niña have opposite impacts on weather patterns and global climate.