I never heard of that. You may be thinking about Ovale Emini. Joye produces the Emini for Ovale. After they starting making it for them, they produced their own brand under the Eroll name. They're the same product with two different brandings. Both made by Joye. There has been some speculation as to whether or not the Emini-branded parts may have tighter quality control because Ovale contractually demands such from Joye but no one knows for sure.
Edit: Ooops.... but, yes, if that's what you're thinking of, the parts between the Emini and the Eroll are fully interchangeable but Emini parts will cost a bit more and can only be purchased from Ovale.