What was the 'brand' of this? Was it an independent grower plant, or a mass produced plant (ie, was it something like. proven Winner, a Costa Farms Tropical Traditions, etc?)
It looks to me like it is possible Royal Queen from the coloration. But its also giving off Rojo Congo vibes.
There are a lot of new philodendron hybrids on the market right now. Many come from TC houses in China. A lot of them look like many of the old established hybrids we already had....Red Sun looks a lot like McColley's Finale or Prince of Orange, 2 old McColley hybrids. These new hybrids have been flooding the market lately and are not always tagged with anything other than 'Philodendron' or 'Tropical Foliage'