Switching between replication and standalone modes in MongoDB?

Question

In my project we need the system to work sometimes as standalone DB without communication to else computers and sometimes in replication mode to reflect all the DB data to else computers. when we switch between options we restart all the system ans its considered as new activity with new tables. the decision if to use more computers (and than we need replication) is of the customer.

Im using ubuntu OS (linux) and I have a services to apply mongodb in every situation (replication / standalone).
my question is if in such case, can I use the same port/ DB folder/ logger of the mongodb for replication and standalone, and apply the services according to the customer decision or I must apply the mongodb in else port/ DB folder/ logger for replication and standalone modes to prevent problems?