The UP3's will work fine. I have several in use, leftover from when I switched from Brand X to NCE.
The UP5's will not work.
The cables may not work, depending on how you did things in the past.
I found that most were fine, but a few did not work.
It is hard to know what I did 10-15 years ago when I first installed Digitrax, but my guess is I used some modular telephone cable from work.
It worked fine with Digitrax but not with NCE. I expect someone out there will know why.