such comparsions are mostly stupid, since there are too many factors that would make it really hard to analyze. i.e. as long as cars are produced the 13k kg hit on co2 will be made no matter if you buy it or not, your old ice car will probably be resold and probably to somebody that can than save co2 emissions per mile, not every electricity is green, your old card was probably produced with more co2, it depends if you upgrade/downgrade/keep your car class, it depends how you drive (and if you ever driven an ev, you will see that its easier to drive it economically), and so on.

of course the plain numbers might make sense on paper but not on the real world.