The ZL-15 is a nice piece of equipment. It has a two speed powershift so it probably uses the same oil.
I'd use the Cat TO-4 or Cat TDTO or equivalent.
No, you can't mix them or you'll be asking for it in a short period of time.
Don't ever use any type of ATF.
What’s the YJ-240? An elevator lift?
If you want to find out what oil is already in it, send in a specimen to an oil lab for analysis, it only costs about $30.00.