Here's a command line displays both counters and strips away all other information the commands also output:
date; awk '/sda1/ {print $3"t"$10 / 2 / 1024}' /proc/diskstats; cat /sys/fs/ext4/sda1/lifetime_write_kbytes
date; awk '/sda1/ {print $3"t"$10 / 2 / 1024}' /proc/diskstats; cat /sys/fs/ext4/sda1/lifetime_write_kbytes
