Your glaze needs to match the temperature at which you are going to fire. Glaze fire at cone 9/10; use cone 9/10 glazes. Glaze fire at cone 6; use cone 6 glazes.
That said, some glazes can be used at multiple temperatures (although they may not look the same or have the same glossy/semi-glossy/matte finish). You might want to make some test tiles and glaze them with your cone 6 glazes and see how they work at cone 9/10. Or, dip your test time in the cone 9 glaze and then dip in the cone 6 (but only top quarter) to see how they work together. Be sure to make a small disk/bowl to put the test tiles in so you catch any glaze runs and get glaze on kiln shelves.