These beads are both formed from the same clay, (Toas Red Stoneware from Texas Pottery and Clay Co.), and the same glaze (Speckled Pink A Dot from Mayco).
The difference is the firing temperature. The brighter pink/red beads were in a cone 05 firing (approx. 1870 degrees F.) and the browner, more subtle pinks were in a cone 02 (approx 2034 degree F) firing.
I am always a bit astonished at the differences in the stoneware clay bodies when it comes to color values in the firings.
Each bead is so different yet many aspects of their creation was exactly the same.