Microfilm Baptisimal Records

I am ordering up microfilm for baptism records for both Huejucar and Cololan for the mid-1880s.

Some of the dates are overlapped by baptisms "naturales". I am not exactly sure what that means.

Which one is best to order to find all the necessary data: the baptisms, the baptisms "naturales", or should I order BOTH sets to be sure to find the necessary data?