Ask them. Although PDF/X-3 has been around for a while, and the only major difference is in the permitted color spaces (calRGB, etc), whether a print provider officially supports it depends entirely on the RIP software they use.
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Ask them. Although PDF/X-3 has been around for a while, and the only major difference is in the permitted color spaces (calRGB, etc), whether a print provider officially supports it depends entirely on the RIP software they use.