Understand that 'talking the same language' can signify shared cultural interests or values. When discussing environmental issues, they immediately knew they talked the same language.
Pro Tip 2/3
Avoid Literal
Don't confuse with actually speaking the same spoken language; it's about shared understanding. They both nodded in agreement, clearly speaking the same language on the plan's direction.
Pro Tip 3/3
Common Interests
Use the phrase to connect with others who have common hobbies or interests. We both enjoy photography; we can talk the same language for hours.