As I say, I don't know much about trout. This is what the DPI say -
The Brown Trout is a thick bodied species with a large head, mouth and moderate to large eyes. The mouth extends to below the eyes. Colours can vary depending on factors such as age and habitat. Generally silver to olive-brownish and darker along the dorsal area. They display dark spots along the back and sides, but these can sometimes be indistinct. Most spots are surrounded by a pale halo and are often red below the mid-line.
"silver to olive-brownish" and the dots can "sometimes be indistinct".
I know sometimes it can be difficult to tell the difference. I am looking at the head shape and your description. Maybe they are both rainbow. But you say they tasted different. The top one was white, which wild rainbow are. Brown trout are pink to red fleshed and the bottom one was pinkish to red. The top one has a roundish head and is definitely a rainbow. The bottom one looks to have a more flattish head and looks more like the head of a brown trout.
I could be wrong, but it looks to me like you have one rainbow and one brown trout.
itsaboat mate...Life is just a boat and then ya marry one !