Note that both models are called with the same API.
from sklearn.neighbors import KNeighborsRegressor
from sklearn.linear_model import LinearRegression
from sklearn.datasets import load_boston
X, y = load_boston(return_X_y=True)
mod = LinearRegression()
mod.fit(X, y)
mod.predict(X)
mod = KNeighborsRegressor()
mod.fit(X, y)
mod.predict(X)