Is the effectiveness of contraceptives containing 21 active tablets less than those with as many as 24 tablets?

Hello. I had been taking Zoley for a long time, but due to its heavy availability, I was forced to switch to The Atywia Daily. My first inquiry is due to a change in the tablet regimen (24+4 to 21+7) or should I protect additionally in the first month? I will take fewer tablets, so I am afraid that there may be less effectiveness. The second question is, will withdrawal bleeding be longer? With zoley it was 1 max 2 days, sometimes the complete absence of bleeding, which I do not hide, was an advantage for me.