Rovers felt aggrieved when the original fixture was abandoned in August, with them leading 3-1, due to a torrential downpour.
Dickov refused to dwell on the original postponement but he was not happy with their performance.
"It's chalk and cheese," said Dickov. "We had six players missing from the abandoned game.
"But take nothing away from Charlton, they looked half a yard sharper than us.
"It grated at the time maybe but I can't let it now. I'm not going to make excuses, we should have done better than we did.
"In the majority of games this season we have competed well, but not here. We didn't match their desire and Charlton wanted it more than us."
- Sports & Recreation