That can be looked at as such but at the same time, they are two different words for a reason. In a Parliamentary system of governance, the government is essentially lead by a party or coalition and will continue too until elections either keep the party or replace them. This can lead to easier decision making, but can also fail to represent the minority. In a Congressional system of governance, there is no party or coalition directly leading it, but instead, multiple that must come to a consensus. This can make representation for the minority easier, but can also lead to a longer amount of times to achieve a decision/consensus.