Yeah it looks spray-painted with a template, nothing special.
The two "9" are very different. If I were to nitpick I'd say "579" was painted separately from "91" (thicker and not lining up). In the video from 2015 digits seem to be more uniform and the "5" is different from the 2022 version. I don't think this means much though given the low-tech method of painting it. Edit: on a second thought, it kinda deflates the idea that those missiles were made and delivered in the same batch, and then stored and launched by the same entity. Clearly made with different number templates at least.
2022:
2015:
The two "9" are very different. If I were to nitpick I'd say "579" was painted separately from "91" (thicker and not lining up). In the video from 2015 digits seem to be more uniform and the "5" is different from the 2022 version. I don't think this means much though given the low-tech method of painting it. Edit: on a second thought, it kinda deflates the idea that those missiles were made and delivered in the same batch, and then stored and launched by the same entity. Clearly made with different number templates at least.
2022:
2015:
Looks to me like someone held the '6' upside down to make a '9' rather than using some different character set and style which seems to be what you are implying. Even if there were some font differences, that would be relatively expected in a place where a lot of serial number painting is done and one has a lot of such work going on (factory, military, etc.)