SegaGenesis

I am a beginner at ceramics and sculpting in general. I bought a ton of supplies after the studio I got a membership at said they required cone5/6 clays and glazes. I didn't realize I purchased 06/05 clay and glazes instead of 5/6. The supplies I purchased is nonrefundable. I will be purchasing more clay BUT the description for the glazes says most colors can hold up if fired up to cone 6. Generally, is it safe to fire glaze up to a cone 6 if its meant to be fired at 06/05? https://www.dickblick.com/products/blick-essentials-gloss-glaze/ here is a link to glaze I purchased.