There was a difference in numbering style between the DD companies and the 'regular' company C. Even during operation Cobra C company was still using the large numbers on the hull (not turret).
Sorry, but I don't see any way to get around this.
BTW the large white stars indicate the tanks with Available Jones are replacement tanks which might be a choice for you. Another issue is the wading equipment on the rear of the tanks... I lack good shots showing this, but it's quite likely those things were still fitted to tanks from the company, or even on replacement tanks. However you might want to assume the opposite....