Re-use a random forest with R -

i'd know if it's possible re-use rules of random forest, on different test set.

for now, i'm using :

  rf <-randomforest(x=train,y=labels_train,xtest=test, ytest=labels_test,  ntree=1000)   save(rf,file = "rf_.rdata") 

i know how save random forest, don't see how can re-use rules, several test set.