Matching head and cab different watts?



I just bought a Randall cab. It's the "XL" series, which is their top
of the line cab that is supposed to go with their "XL" line of heads.
But the watts are not really matched. First off, the head is Solid
state (tube preamp) with these ratings:

400W @ 4 Ohms, 280W @ 8 Ohms, 500W@2 Ohms

The matching cab (4x12) is this 240W RMS with switchable ohms.
Although they say on the site that it can "handle" 280W.

Why would they mismatch them like this? They just came out with a new
cab model that's 400w. But of course, it's too late for that now on my
end.

Two questions:
Are mismatching amp components of the same model series like this
normal?

Is there a chance I'll blow my cab if I get the head that's made for
it (?!)


.



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