No, they aren't. The protection you get against arc flash and radiation depends on the shade of your lens. Some welding jobs produce a lot of arc flash, meaning they need much darker lenses. Others have less light and will be ok with lighter lenses.
Most passive welding helmets come with a single shade. They are hence not suitable for every kind of welding. To make them convenient, you need extra lenses for each type of welding. It would be best if you also had the necessary expertise to change lenses from these helmets.