After you LB something, it gains a (set amount?) of experience. I think it depends on rarity. IIRC for God, it's ~4500 and ~5200 for God +? Which is about equal to what it would gain as if you had fused a single digi from that rarity tier.
Although I could be confusing these numbers woth something. It might be a species specific number. I'll make a note next time I LB something.
If anyone else is reading this, and cares, can you do the same? If you LB something, just take a note of the rarity, species, amt of xp, and level upon LB. I'm curious as to what the connection is.
Edit: To actually answer the question I responded to, yes Phantasmos, I think so.