What are some similarities between igneous and metamorphic rocks?

Igneous, sedimentary, and metamorphic are the three types of rocks. Among these, igneous and metamorphic rocks share the following similarities:
Both of them are types of rocks.
Temperature is a key factor in the formation of both types of rocks. Igneous rocks are formed from the cooling of magma, which is formed as a result of high temperatures causing rocks to melt. Metamorphic rocks are formed as a result of temperature and/or pressure action on existing rocks causing changes in the composition and resulting in the appearance of minerals in rocks. This process is known as metamorphism and results in the formation of metamorphic rocks.
Both igneous and metamorphic rocks are part of the rock cycle and can transform into other types of rocks over time.
Hope this helps.