Car seat weight help please!

Yaz • 28y | Baby boy born 12 June ‘19! 🧔🏻👩🏻🐱👼🏻👶🏻

Can anyone who has the following car seats pls say if the given weight on the website is accurate? I carried a friend’s Maxi Cosi and it was wayyyy heavier than 4kg 😳

Asking because none are available in my country and I’ll have to buy online without physically checking it out first :(