A slight difference in your signature between the 12th board hall ticket and COMEDK hall ticket is unlikely to be a major issue during counselling.

The main purpose of the signature is for verification purposes. As long as you can confirm your identity through other documents like your admit card photo and ID proof, a minor signature difference shouldn't cause problems. There have been instances where candidates have reported slight signature variations between documents without facing issues during counselling.

If possible, try to maintain a more consistent signature going forward. This will avoid any confusion in future applications or documents. During counselling, ensure you carry all the required documents, including your photo ID, board admit card (original and photocopy), and COMEDK admit card (original and photocopy).

I hope it helps!