You’re welcome!
I’ve looked up my notes and cast acrylic is the one you need as the extruded one melts indeed.
I have no idea how you can see the difference if there’s no product label on it.
In case you’re interested I logged my experiences here; Acrylic on LR2
I currently use a random single flute upcut bit. I even bought expensive dedicated acrylic bits, but they are for high speed routers and my LR2 can’t handle it. So these are stored away hoping to finish my lr3 one day to try them again or to throw them in the bin.