Hold yiur horses on EU261 as this involves a cancellation there are various timescales that need to be met including if an earlier departure is involved as well as the difference between the actual and originally scheduled arrival times before EU261 kicks in. Also the OP would need to apply for it. kLM won’t just pay up.and of course the reason for the original cancellation is also important in determining if anything is due,

if you have been rebooked then that shows EU261 is working as the airline is doing all it can to minimise the delay.