I just changed my oil and filter yesterday and bought a washer from Halfords (generic Renault one) and the 'proper' one from Renault. They are the same size, the Renault one has the rubber insert as you mentioned, the part no. is R77 00 266 044 (01A06D Washer) priced at £2.50 + VAT!!!
I decided to fit the proper Renault one, and noticed the one I removed had a split rubber so I couldn't have reused it anyway. As for whether your one will work, I honestly don't know, although I don't see why not?