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Sorry for the Necroreply: But I'm upgrading the FT Prusa i3 2020 to the p3steel v4

AFAIK, it depends on WHAT upgrades we are talking about:

The biggest changes I've seen so far are:
an increase length and diameter of the y-axis smooth rods. (10mm x 510mm)

But perhaps his Github wasn't as refined a year and a half ago. https://github.com/AlvaroRey/P3Steel_V4_20x30

But, as is the custom, I'm sure I'll be doing a little bit of trial and error when it's time to swap frames.