I don't know where you heard about putting CVT fluid in an early CR-V rear differential, but I think that is a bad idea. And definitely don't mix the two fluids.
First remove the fill bolt, then remove the drain bolt.
Drain the old fluid out, replace the drain bolt using a new crush washer, and fill with Dual Pump Fluid II.
Then replace the fill bolt, also using a new crush washer.
First remove the fill bolt, then remove the drain bolt.
Drain the old fluid out, replace the drain bolt using a new crush washer, and fill with Dual Pump Fluid II.
Then replace the fill bolt, also using a new crush washer.