If you are going to print these then you are much better served by PostScript than SVG. PostScript engines have better quality checks than SVG. But more than that postscript actually defines printer colorspaces something that SVG does not do well at this point, not that most viewers would even begin to support this.

Regardless of format issues you should be talking about the manufacturing with the manufacturer. Not us, so the only way to iron out manufacturibg issues is to talk with your manufacturer about their requirements and sofyware used, not speculate on what they use.