Switching birth control brands

Andrea
I started taking Gildess FE 1/20 mid March and after taking it for three months, my doctor switched me to Viorele 28 due to spotting. Gildess was a 21 day regiment and I knew which ones I could skip to prevent my period.Viorele is a 28 day pack and im not 100% sure which ones are okay to skip. Is it the same week 4 that I can skip?