Is SimpleAggregate order-safe while do pipeline operations?

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Hi, as I can see in different tutorials (ex. https://www.mongodb.com/blog/post/quick-start-golang--mongodb--data-aggregation-pipeline) they use mongo.Pipeline which is []bson.D. In code for SimpleAggregateCursorWithCtx pipeline is bson.A (not bson.D which is ordered):

func (coll *Collection) SimpleAggregateCursorWithCtx(ctx context.Context, stages ...interface{}) (*mongo.Cursor, error) {
	pipeline := bson.A{}

	for _, stage := range stages {
		if operator, ok := stage.(builder.Operator); ok {
			pipeline = append(pipeline, builder.S(operator))
		} else {
			pipeline = append(pipeline, stage)
		}
	}

	return coll.Aggregate(ctx, pipeline, nil)
}

Can you please say, if I want aggregation with $match at first and $lookup, can I use SimpleAggragation methods?