There's nothing wrong with buying a different, genuine Rolex dial that is compatible with your genuine Rolex timepiece. In particular, folks who own the Daytona models can have multiple dials (e.g. both the black and white dials for the iconic stainless steel Daytona model 16520 and 116520).
I have a yellow gold Daytona 116528 that rolled out of the Rolex factory with a champagne dial with diamond markers (it's even noted as such on the Rolex guarantee card). For less than $500, I bought a genuine champagne dial without diamonds as an option to swap out the diamond marker dial. Have yet to change it, but if I ever decide to sell the timepiece, I'll certainly make sure to include pics of it "wearing" both dials.