Motorola cross compatibility?

Hi all, I have two Motorola Handie Pro radios, and 4 Motorola XTN radios (nowhere near the quality of the Handie Pros). I want to make them talk to each other but I don’t seem to be able to. Does anyone know if this should be possible or not?

P.S. I don’t seem to be able to access the CTCSS (PL) codes on the older Handie Pros, i THINK there were two types of these, one you couldn’t access CTCSS code, the other you could. I could be wrong here, but have a vague memory of someone telling me that once a long looong time ago!