Depends on which system of FMA you compare to which system of PS. As I mentioned there are some Silat systems that are technically FMA so you can find some amazing similarities.
But it still depends on which specific systems you're referring to. Harimau, for instance, is primarily a groundfighting system and, consequently, quite a bit different from Cimande which is primarily a stand up system. Both of these are Pentjak Silat, though.
Again here is the 9 Gates footwork pattern. The directions of this pattern are used in Silat like techniques, for example if you know the directions then you may simply cross-step, instead of stepping to the left (90*) with the left foot, you cross-step with your right and go into a low 3 point position, or a kneeling poistion, your counter is to use the foot you cross-stepped with and do your takedown/sweep from that low position. These cross-stepping movements are the third level in the Imua Tamaraw system. The same movements are covered in Harimau and other forms of Silat.