In actuality there is quite a difference. 8,000,000 C is 14,400,032 F and 8,000,000 F is only 4,444,426 C. These are pretty different temperatures, but for reference the surface of the sun is 5,500 C or 9932 F. So 8,000,000 C or F are both fairly warm. Though it’s anyone’s guess what they’re talking about, 8,000,000 could be only slightly abnormal if we had proper context. I won’t be giving you said context, but you know, it’s there.
There really isn’t that much of a difference. They’re well within an order of magnitude of each other, and in astrophysics, any numbers within half a dozen orders of magnitude may as well be identical. More to the point, that’s a high enough temperature to be well beyond any possible phase change or other boundary. It really doesn’t make much difference.