Steering rack from a Mark 1 Escort

[Enoch]

I have been offered a steering rack from a Mark 1 escort. Does anybody know if it will do the job or if it has to be one from a Mark 2 as per the book? I have been told it's only the length of the splined shaft that goes to the steering column that is different but can't find any info to back this up. Anybody know any different?
Thanks in advance.