What is the difference in capacity of the different Multimac widths?

Just comfort, like aeroplane seats – First class, Business class or Economy. Even he narrowest Multimac 4-seater [1200] has been crash test approved with 4 x 32 kg [12 yr old] dummies.

The biggest practical difference is that the narrower seat will not take a MINIMAC, so that if you have a Ford Fiesta for example, you could fit a narrow 4-seater [1200], but if you had a baby and needed a MINIMAC, you would have to fit a 3-seater [1000], which will actually take 3 MINIMACs.