hey i just recent bought a banana pastel, looks very similar to your snake. I too am having a hard time IDing it. It lacks all Yellow atm. I went to a local reptile store to buy a set up and was gonna order online but I loved this snake. Now they told me it was a banana pastel but after researching Im just not seeing any yellow so that can't be a banana.Ive found snakes that looksimilar "lavander snow" and the onlybanana pastel i find anywhere is about 3-4x price of that i paid.
Ive read Banana sometimes lack color til they age