What are similarities of TPE and TPU?

I bought some TPE filament from 3D Solutech and have tried to buy more from them, but it seems they are not making any more. I need flexible for the products I am making. I see that there is more TPU available than TPE, but I don’t know the differences. I know what the initials stand for and what TPE can do. Where can I find spec sheets on these materials?

Honestly, I just googled “TPE datasheet” and “TPU datashhet” and came up with a whole whack of them. That’s good enough if your looking for generalities, but if you need specifics, you’ll also need the manufacturer’s name and filament name.