I've seen a couple of grey painted filters with divisional stock numbers, also a couple of dug up filters vere in grey. I don't think that civilians can use modern army style masks just with repaint. The war time issue civilian mask GP-2 was especially made for civilian use. The rubber patches is the factory work and not a repair. A lot of mint circa 60's Schm-41 gasmasks I've seen in untouched boxes, has the patches on it.( when soviet army gone from Estonia, they leave a thousends of unused masks)
I think Ruslan and Jura got their masks from the Finnish war stocks. It's a not a secret that the Finns still has a lot of Soviet stuff on their stocks.