Are the SAT reading passages full length?

On the real SAT and on other practice books/sites, the reading passages seem to have sometimes up to 20 lines more than the reading passages on Khan Academy. They also feel much shorter and thus faster to complete. Usually, reading passages can have anywhere from 80-100 lines (excluding the dual passages) whereas these ones usually only have 60-80 lines. Are the SAT reading passages on Khan Academy actually shorter than real SAT passages?