Is it OK to use same amount of double acting baking powder versus the amount of single acting one in baking?

I never knew that, love learning something new!

Yes, nearly all present-day baking powders are double-acting. Single-acting BP can be made in a pinch using equal amounts of tartaric acid (cream of tartar) and baking soda. Double-acting BP contains two acids, not just the one. Equal amounts are fine.