RZR4 conversion questions

I recently inherited a RZR4 that had a z1turbo conversion put into. The enginge is not running and we are in the process of taking it out and figureing out why. My question is if it is blown and requires a new motor can you put in the 1000 in place of the original 800 that was in the rzr or do they not match up? Trying to figure what my swap options are if the Z1 is toast. Thanks for the info