No, you don't have to have the 1000 pic turbine, because I didn't.
They are extremely flexible and they absolutely love people who have flown night freight (and survived) and want to do it for the rest of their lives.
I did have a caravan driver in my class who had 800 pic on the caravan and no pic in a multi turbine, and only 500 pic recip multi and less than 4000 total.
If you get the interview the only thing they are interested in is your attitude. Know everything about the company and you are in.
To get the interview however you must have an internal rec.
N