All acrylic (e.g. plexiglas) is opaque to 10,600 and 9,600 primary wavelengths from CO2 lasers in normal thickness, so any acrylic suitable for 455nm will also be suitable for CO2; the addition of dyes that absorb at 455nm (Plexiglass 2422 is reported to be such, and you can buy tested and certified versions of it) won’t make it transparent to 10,600nm or 9,600nm.