Can I replace capacitor with multiple lower value capacitors in filter?
Yes, as long as the parallel capacitances sum to the capacitance of the replaced capacitor there is no difference in the circuit. This is typically done in order to get a non-standard capacitance value out of standard capacitance values. For example, if you need \$8.6\mu\$F then you can put two standard \$4.3\mu\$F capacitors in parallel to get it since \$8.6\mu\$F is not a standard value.