Regarding Mitsubishi trucks, the difference of type shows the difference of spec.
Therefore, you can understand the spec. only by looking up the model code.
You can check the rules on the "How to understand the spec. by model code" page.
FE305B, FE315B, FE325, FE335, FE355E, FE425E, FE435, FE445 and FG335 have the 4D32 engine.
FE637, FE63CE, FE667E, FE70CB, FE71CB, FE72C, FE73C, FE82C, FE83CE, FG327B,
FG337, FE437E, FG507B and FG537B have the 4D33 engine.
Mitsubishi FUSO Canter Guts has a little lower payload than Canter.
Compared to 2.0~4.0t of Canter, Canter Guts is 1.25~1.5t.
Basic vehicle stability is same, but Canter Guts has a low truck bed and stability is better because of low center of gravity.