[dpark]

> I wonder if space agencies have agreed to build space vehicles on a standardized side.

Because space vehicles often need to share space roads?

[DrScump]

Not generally, but note that the Mars Climate Orbiter[0] was lost due to an SAE-Metric conversion failure:

[0] https://spacemath.gsfc.nasa.gov/weekly/6Page53.pdf

[dpark]

What does that have to do with imaginary roads in space?

I would also not consider a planetary rover to be a “space vehicle”. Being on a planet is rather the opposite of space.