How to make FastRelax use smaller number of rotamers from PyRosetta app?

I am using FastRelax from PyRosetta. When I run it from PyRosetta, the number of rotamers built are way more than the number of rotamers when I run it with C++ relax binary. For instance: I use the following to relax a pdb with movemap in PyRosetta as follows:

def relax_pdb_with_movemap(self, pose, movemap):

        relax = FastRelax()

        relax.set_scorefxn(get_fa_scorefxn())

        relax.set_movemap(movemap)

        relax.apply(pose)

        return pose

In C++ I give the following command:

relax.linuxgccrelease -s test.pdb -in:file:movemap test.movemap

The same files (test.pdb and test.movemap) are passed to the PyRosetta function. But I see different outputs:

PyRosetta output:

protocols.relax.FastRelax: ================== Using default script ==================

core.scoring.ScoreFunctionFactory: SCOREFUNCTION: ref2015

protocols.relax.FastRelax: CMD: repeat  2688.76  0  0  0.55

core.pack.task: Packer task: initialize from command line() 

core.pack.pack_rotamers: built 2045 rotamers at 38 positions.

core.pack.interaction_graph.interaction_graph_factory: Instantiating DensePDInteractionGraph

core.pack.interaction_graph.interaction_graph_factory: IG: 4124016 bytes

core.pack.annealer.FixbbSimAnnealer: pack_rotamers run final: YYEKHTHVDTLYRYHYYITKWVQLYTWYRGPGRAFVTI, best_energy: -236.068

C++ output:

protocols.relax.FastRelax: ================== Using default script ==================

core.scoring.ScoreFunctionFactory: SCOREFUNCTION: ref2015

protocols.relax.FastRelax: CMD: repeat  2395.51  0  0  0.55

core.pack.task: Packer task: initialize from command line() 

core.pack.pack_rotamers: built 598 rotamers at 38 positions.

core.pack.interaction_graph.interaction_graph_factory: Instantiating DensePDInteractionGraph

core.pack.interaction_graph.interaction_graph_factory: IG: 412404 bytes

How to make PyRosetta build same number of rotamers as that of C++ relax app?

Thank you very much.