Is there a difference between treatment of calcium channel blocker and beta blocker overdose/poisoning?

No. They're essentially the same.

With symptomatic bradycardia consider activated charcoal, atropine, glucagon, IV calcium, high dose insulin-glucose and vasopressors.

Source

Barrueto, Fermin MD. "Calcium channel blocker poisoning." Up to Date. 16 March 2006. <http://www.uptodate.com>

Lemkin, Ellen MD, PharmD and Barrueto, Fermin MD. "Beta blocker poisoning." Up to Date. 9 June 2008. <http://www.uptodate.com>