Matched pairs from RØDE aren't necessarily (and in almost every case aren't) sequentially serialised.
The serial numbers are engraved at the end of the machining process, prior to assembly of the electronics, acoustics and quality assurance. Following these processes, a certain percentage of microphones (depending on model) are matched together to make the matched pair kits. Each matched pair is supplied with a signed and dated certificate listing the two matched serial numbers.