@La_chica_gomela is correct. It’s not harmful to skip periods by extending your active pill use and you can do it with any monophasic pill brand where all the active piils are xactly the same as opposed to the kind where the hormone amounts change over the 3 weeks.
The makers of Seasonale originally took Nordette, a pill that had been around for a long time, and packaged it with the 12 weeks of active pills and then did the studies to prove to the FDA that it was safe and effective. Docors and nurse practitioners had been using extended active pills “off label” for years before that and we knew it worked OK.
There’s even a one year extended packaging now called Lybrel.
@mclaugh extended active pills actually tend to be more effective because they suppress ovulation more successfully by not going without active pills for 7 days every month. That’s why we use extended active formulation for women with ovarian cysts, endometriosis and cyclical migraines.