Your 1.51 F SI1 has strong blue fluorescence, that’s why it’s cheaper. I can see some strain lines. I usually avoid that with fluorescence because I think they interact to produce the haziness, but it’s hard to say from these pictures alone. There also seems to be some kind of feather next to the crystal in the middle of the table that’s not marked on the inclusion map.
I deleted my rec in your other thread. Upon further review, I somehow missed the feather in the table. I don’t have a suitable replacement; it’s hard to find a nice option that fits your criteria.