yes

if you keep yaw/pitch the same; from 450 dpi to 800 dpi:

0,05 => 0,016
0,1 => 0,032
0,15 => 0,047
0,2 => 0,065

Use this to calculate your new cl_mouseaccel value.

http://konr.co.uk/mouse/

http://www.ncts.at/files/sens_accel_calculation.txt
also higher dpi provides more counts at the same physical speed which might feel less controllable due to higher count change variety while accelerating and therefore more accellerated movement values which are being summarised with non-accelerated movement(which is also more variable). All of it makes accel few times less controllable on higher dpi.
Correct me if im wrong, could never use accel myself