Type A? Type B? ... then what's B2??

[WillyChang]

Pretty mystified as to what medium-narrow tyres that Tamiya provides

in some kits... anyone knows what's provided in the box of:-

TA04-PRO

Ferrari Modena TA04

TA04-R

TB Evo III

A, B or B2 ?? Inserts??

Are they the same as these boxed OP parts?

ITEM 53433 (OP433) Medium-Narrow Tires Type A

ITEM 53434 (OP434) Medium-Narrow Soft Inner

ITEM 53435 (OP435) Medium-Narrow Hard Inner

ITEM 53412 (OP412) TA04-PRO Tires Type-B

ITEM 53482 (OP482) Medium-Narrow Tires Type B2

thanks in advance!