Well...
Code:
Update_kindle_3.4_B006/611680021-1725970040
And those matches the min/target OTA level field in the headers, so, nope, you wouldn't even be able to click the 'UYK' link for the 3.4 update if the host isn't running 3.3.
(That's for the manually downloaded updates, of course. The ones downloaded OTA are usually more specific, tailored to match the device they're being pushed to).