Beyblade X CX or CX Infinity: what changes inside the blade?

The difference to look for is inside the blade assembly. The CX blade on Fang Leon T 4-60U separates into three pieces. The CX Infinity blade on Rage Ragna FE 4-55Y separates into four. Those counts describe the blade alone. Each example also has a ratchet and a bit.

Lay out the two blades

On Fang Leon, the blade comes apart into a lock chip, primary blade and auxiliary blade. On Rage Ragna, the blade assembly uses a lock chip, overblade, metal blade and auxiliary blade. If someone gives you a loose tray of parts, use the diagram for the exact release before deciding whether a blade is complete. Hasbro’s Fang Leon breakdown · Takara Tomy’s four-piece blade diagram (Japanese CX-15 edition)

Which would you start with?

Pick Fang Leon if you want to learn the three-piece CX layout with one complete stock combination. Hasbro describes the assembled top as Balance Type and its blade as Attack Type. Both labels can be correct because one describes the whole top and the other describes one assembly.

Pick Rage Ragna if what interests you is taking apart a four-piece blade. Hasbro describes the stock combination as Stamina Type. An extra component gives you another piece to identify during assembly. Counting pieces alone cannot predict which top wins a match.

Do you need a new arena for these two?

Both are Beyblade X starter packs with right-spinning tops and launchers. Each requires a Beyblade X stadium, supplied separately. If you already have the correct arena, start by trying each top in its stock configuration. Record the full name before taking it apart so you can restore it later. To compare your results round by round, keep score for a four-point match.