Fishing Pole Trap but playing Bishop B4

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So the usual line for the Fishing Pole Trap is by playing the Ruy Lopez, where Bishop goes B5.
But what if I want to attempt the Fishing Pole Trap but playing Bishop B4 as in an Italian Game?

What could be different from playing bishop B5?

Thanks

ChampoftheBepoCamp

Bump to help ya...

blueemu