I think we don’t understand why would you want a master’s in a different field than you have already studied? Some people come from another field INTO landscape architecture by getting a master’s in landscape architecture. If you already have a bachelor of LA, then changing to something else for a master’s is not likely to help you in LA.
If you want to work in something else, then figure that out and inquire from people in the other field if your LA degree will help you. A master’s in urban or conservation studies might value your background, but not something like medicine or fine art, for example. Pardon if I don’t understand the question well.