Just to be clear, I assume its a simple X-70A and not a X-70A3D (Very different)
X-70 and X-70A use same EAGLE PC-2 POWER CABLE 8-53. They also used the same transducer and Speed/temp sensor.
I’m not sure on menu differences, you would need to pull up old manuals and compare. X-70 was updated to X-70A with a faster processor and I think more pixel lines (not confident on that). However the X-70 was then re-launched with the GPS capability and became the LMS-350
I think I may have 4 or 5 of these units still in the garage. I’ll look later when I can