Get a 2nd B4 instead - the Mad Rat won't serve well as a backup principally because wheel fitment will be a royal PTA, eliminating any cost benefit to a cheap roller (which will not go for much less than a new one).
Its easier to fit 12mm hex wheels to a B4 (using XXX-S or TC3 hex kit) than it is to fit B4 wheels to a Mad Rat without wheel hexes (axle width is different). Front wheels are completely incompatible.
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