Phal Corona 'Lemon Bomb' appears to be grex Corona and clonal name 'Lemon Bomb'. Seedlings under that listing might be others from the same cross (grex)--which would make them siblings to Lemon Bomb; or sometimes sellers use seedling as a size, vs a literal seedling.
I did a quick websearch, and the listing I found showed Phal Corona 'Lemon Bomb' but the plants for sale said seedlings of the same cross (Corona)...ie, not 'Lemon Bomb' but its siblings (who may or may not look like it).
So, if I understand this all correctly, you could remake the Corona cross, and hope to get similar flowers, but they would not be 'Lemon Bomb'. Who knows, you might even get something better, and get to give it your own name!