I dont need a auto ser line. Just making it run in 3x230v. When i Reed the tecnical manual for the 230/460 version. I can see that most cards are the same
You want to get the parts manuals for both.
Compare side by side and see what bits are not the same.
Those are the bits you need.
Get prices and see if it is worth doing.
You’re probably best off emailing Miller to find out exactly what you need, then have a trawl around a few dealers to get the best price for whatever parts you require.