Were there any major differences between the nobility in Outremer and in Europe due to different cultural influences?
I have a few previous answers for similar questions:
What was life like as a European living in a crusader state?
Was there ever a distinct Outremer Culture in the Kingdom of Jerusalem and other Crusader States?
How did a Crusader State and regular European Fiefdom differ?
Hopefully those are helpful! I have a lot of answers about the culture of the crusader states that might also be interesting.