Assuming the manufacturer used the spline to line up the guides you have to then look at the guides themselves. Guides are designed to handle specific line sizes. Guides should be compatible to the line size rating for the rod. Each length rod should have a specific number of guides. For example, a 7-foot rod should have nine guides, including the top.
Guides come in two styles, single foot and double foot.
The feet are what attaches to the rod. Double foot guides are stronger but they are slightly heavier and you loose a small amount of flex in the rod. Single foot guides are lighter but are not as strong as the double footguides. Even though single foot guides are not as strong, they will work fine for most bass rods. Many new fishing rods have a combination of both guide types, using double foot guides near the handle and single foot guides near the tip where the rod flexes the most.