Good advice to make a call.
RV roofs are made to expand and contract. TPO and EPDM do that at different rates and whoever made a 'two-part repair' like that was doing for a cosmetic quick fix using whatever product they had on hand. I've seen shops do this a few times and it's a mistake. They do it to unload the unit.
I think at this point, for you to cover them both with one type of coating might not work too well because of the rates of expansion differ under your new coating, but that's just my opinion and you should do as suggested to be sure....call Dicor and make sure you talk to someone that knows what they are talking about, like an authorized tech.
If I was having roof issues and planned to keep my rv I would not try to patch it in order to try to save money. From what I have seen with people doing this is, they have to go back and do it over and end up spending more money. I would replace the entire roof using one product and start from new , that way you know it was done right, eliminating future issues.
I have a full fiberglass roof on my unit and love it, I would explore that replacement option if you plan to keep your unit .
One other thing I forgot to mention is, rv roof age might make a difference on what product you use to coat it. Roofs from 2011 are not the same chemical compound as a new ultra TPO made today.