I have Incarnation of Morbidity, which has 2 tracks and an intro. Its definitely Cemetary, starting with an evil creepy organ then goes into a nice doomy riff. Its straightforward the whole way through, and ends with a nice faint lead over the main riffs. Kinda somber.
Beyond the Grave picks up the pace after a minute but its nothing super fast, then shifts back into that doomy gallop. Nice riffs and lead. Overall its a great piece of history, I wouldn't kill to own it, but if you can find it, either by compilation or download, I'd do it. Production wise its slightly more deep than the Lp but they're all great. I'm trying to find the other demo myself.