Seed-directed synthesis is an efficient method to obtain useful zeolites. Thus, the structure-directing ability of seeds is still not well understood. It is still important to illustrate the structure-directing ability of seed. Herein, a comprehensive investigation on the crystallization of borosilicate zeolites with the presence of Octyltrimethylammonium Chloride (OTMAC) was performed by introducing seeds with different frameworks into the new constructed versatile Na-borosilicate system. The adopted Na2O–B2O3–SiO2 system was capable of synthesizing magadiite, a layered silicate with abundant 5-membered rings (5-MRs). With the presences of OTMAC and seeds, a total of 14 seed-to-product zeolite pairs (including 9 isomorphic pairs) were obtained. The crystallizations were governed by both the seed structures and gel compositions. There existed both weak and strong directing effect between the structures of seeds and products. For strong directing effect, a hypothesis was proposed that there were similarities in n-MR distributions of the structures between products and seeds, which may act as the driving force for the crystallizations of certain structures that could be used to explain seeded growth in zeolites syntheses.