The pellets are no more dangerous than the paste product. They are the same ingredient--not just a similar ingredient. They still have the same margin of safety in dosing as the paste, kill the same parasites as the paste, etc.
Now, if you used a pellet that was not ivermectin that's a different story but currently the only pelleted daily dewormers are pyrantel tartrate daily dewormer or ivermectin top dressing dewormer (not labelled for daily use).
Licensed Veterinary Technician